| A B Consulting | See Kenchington Ford |
| Acer Group | Hyder Consulting (1996) |
| Adams Kara Taylor | Acquired by White Young Green (2006), management buyout with Tyréns to form AKT II (2011) |
| Allott & Lomax | Babtie (2000), retained name for some time, now Jacobs |
| Allott, C S & Son | Allott & Lomax, then Babtie (2000), then Jacobs Babtie (2004) |
| Amec Foster Wheeler | Bought by Wood Group (2017) |
| Andrews, Kent & Stone | Merged with Anthony Ward partnership to become AKS Ward (2005) |
| Andrews, Walter C | Andrews Associates |
| Anemos | RWDI Anemos (2004) |
| Applied Geology | Rust (a subsidiary of Rust International), then Rust Environmental, then Parsons Brinckerhoff |
| Aspen | Waterman Aspen |
| Atelier One | SMP Atelier One (1994, with Stephen Morley Partnership) |
| Atkins, W S | Bought by SNC-Lavalin (2017), now AtkinsRéalis (2023) |
| Babbé, Don | Babbé McCathie Partnership (2014) |
| Babcock Water Engineering | Earth Tech Engineering (1998) |
| Babtie | Jacobs Babtie (2004), then Jacobs (2006) |
| Babtie Shaw & Morton | Babtie (qv), then Jacobs Babtie (2004), Jacobs (2006) |
| Baguley, Maurice | Acquired by Hurley Palmer Flatt (2000) |
| Baker and Mott | Mott Macdonald |
| Baker and Shelford | |
| Balfour | D Balfour, then Faber Maunsell |
| Barclay Dowds | merged with JMP Consultants (1989) |
| Barry & Brunel | see Wolfe Barry |
| Barry & Leslie | see Wolfe Barry |
| Barry, A J | see Wolfe Barry |
| Barry, A J, Cochrane | see Wolfe Barry |
| Bateman, J F | G H Hill (c1890) |
| Bay Associates | Acquired by Supporta plc (2006), acquired by HLN Architects (2009) |
| Beattie Watkinson | Dissolved 2010 |
| Beer, A E | Beers (1981) |
| Benaim | Acquired by Scott Wilson (2008) |
| Berger, Louis | Acquired by WSP (2018) |
| Bertlin | Scott Wilson Kirkpatrick (late 1980s), initially as Scott Bertlin. Bertlin name disappeared c1995 |
| Bettridge Turner | Acquired by Hyder (2006) |
| Bianco, J C | |
| Billington, Roy Associates | Merged with T D Bingham (2005); T D Bingham merged with Nixon Davis to become Bingham Davis (2006) |
| Bingham Blades | Bingham Hall O'Hanlon (the Welsh offices, 1981), then Bingham Hall Partnership; Bingham Yates ( Edinburgh office (1978). Merged with BMMK Cotterell to form Bingham Cotterell (1988), acquired by Mott MacDonald (1998) |
| Bingham Cotterell | Acquired by Mott MacDonald (1998, former name retained for a while) |
| Bingham, T D | merged with Nickson Davis to become Bingham Davis (2006) |
| Binnie & Partners | Binnie Black & Veatch (1995), then Black & Veatch (2003) |
| Birkett Stevens Colman Partnership | Merged with GHA Livigunn (2009, both retain name) |
| Blair, J F | Crouch and Hogg (19th century) |
| Blyth & Blyth | [Management takeover (2004)] |
| BMMK Cotterell | Merged with Bingham Blades to form Bingham Cotterell (1988), acquired by Mott MacDonald (1998) |
| Bobrowski, Jan | NRM Bobrowski (2004). NRM Bobrowski acquired by Capita Symonds to become Capita Bobrowski (2008) |
| Bolsover, Roy | Dissolved 1999 |
| Bowden Sillett | Train & Kemp (c. 2001) |
| Bradbrook Consulting | Purchased by Hurley Palmer Flatt (2016) |
| Bradshaw, Buckton and Tongue | Waterman BBT (1989) |
| Brakenridge & Miller | MCMK, then ZMCK (1982) |
| Brand, Frederick | Brand Leonard (1994) |
| Brett Associates, Peter | Acquired by Stantec (2018) |
| Brierley Lovell Partnership | Separated into Brierley & Co and AGL Consulting (1996) |
| Brimer & Martin | see Brimer, Andrews & Nachsen |
| Brimer, Andrews & Nachsen | Merged with Brimer & Martin and Maggs and Keeble to form Brimer, Martin, Maggs, Keeble and Partners (1962), BMMK & Partners merged with A P I Cotterell & Son to form BMMK Cotterell (1981), merged with Bingham Blades to form Bingham Cotterell (1988), acquired by Mott MacDonald (1998) |
| Brimer, Martin, Maggs, Keeble & Partners | BMMK & Partners, merged with A P I Cotterell & Son to form BMMK Cotterell (1981), merged with Bingham Blades to form Bingham Cotterell (1988), acquired by Mott MacDonald (1998) |
| Broad and Gloyens | Merged with CCP to form HAP (2001), then HAC (2006) |
| Brooke, Richard | Taken over by Mason Clark (2005) |
| Brown Crozier and Wyatt | Humphries and Brown. A Caton Crozier left partnership in 1980 |
| Brown, Kenneth and Partners | KB2 Consulting Civil and Structural Engineers LLP (2008) |
| Brunel Design Group/Consultancy | taken over by McAndrew Martin (2014) |
| Buchanan Consulting Engineers | Capita (2005) but retains name |
| Buck, D V | Parkman Buck, then Parkman, then Mouchel Parkman |
| Building Performance Group | Acquired by BRE (2006) |
| Bullen | Faber Maunsell (2005) |
| Bunce, John W | incorporated into McKelvey Ellis (1986) (qv) |
| Bunyan Meyer | Campbell Reith |
| Burgess Associates | Dissolved 2004 |
| Burks Green | Acquired by RPS Group, now RPS Burks Green (2006) |
| Burns, T F | see Posford Duvivier |
| Burrow, John | Burrow Crocker, then DHV Consulting (c. 1991-2), then Aspen Burrow Crocker, then Waterman Burrow Crocker |
| Bush Booth | Dissolved 2006 |
| Bylander Waddell | Liquidation (1999), then Bylander 2000 Ltd (2000) |
| C & R Design Ltd | Merged with Alan McEwan Associates to become AMA Consulting (2014) |
| Cairns & Byles | WSP Group plc (1988) |
| Caldwell Consulting Engineers | Willis Caldwell Ltd (2004), then WCL St James |
| Cameron Holdsworth | Nickalls Roche McMahon (2003), then NRM Consultants |
| Cameron Taylor | Scott Wilson (2006) |
| Cameron Taylor Bedford | Cameron Taylor (2005), then Scott Wilson (2006) |
| Cameron Taylor Brady | Cameron Taylor (2005), then Scott Wilson (2006) |
| Cantor Seinuk | WSP Cantor Seinuk (2000) |
| Carl Bro | Grontmij (2007) |
| CCP | Merged with Broad and Gloyens to form HAP (2001), then HAC (2006) |
| Cetec | White Young Green (2005) |
| CH2M | Purchased by Jacobs (2017) |
| Chadwick & Associates | CASE Consultants (1996) |
| Chapman, Smart & Barker | Barker Chapman (1984) |
| Christie, S P | Christie & Partners |
| Civil Engineering Design Group, British Rail ( York ) | CEDG York Ltd, (1995, within British Steel) |
| Civil Engineering Design, British Rail (Croydon) | Atkins ? (1995-6?) |
| Clarke, Nicholls, Marcel | Bristol office became Clarke Bond Partnership (1986), then Clarke Bond Group (1999). Clarke, Nicholls, Marcel continues to operate under that name |
| Cole, C W Associates | Merged with Pearlstone Gilbey Partnership to form Pearlstone Gilby Cole Partnership which merged with A F Roessler & Associates to become PGC-Roessler Partnership. Purchased by PGCS Partnership (2008) |
| Colquhoun, Brian | Thorburn Colquhoun (c. 1993-4?, with Thorburn), URS (1999), URS acquired by AECOM (2014) |
| Conisbee, Alan and Associates | Conisbee (2007) |
| Considere | HLN Engineering (2013) |
| Coode Blizzard | Graham Group (1994), WSP Group plc (1997) |
| Cook White Partnership | Nickalls Roche McMahon (1998) then NRM Consultants |
| Cook, E J | Costain |
| Cooper Macdonald | Practice dissolved (1993) |
| Cowan and Linn | Blyth and Blyth (2006) |
| Crabtree Morrell | Beers (1981) |
| Craddy & Partner | Craddy Pitchers (1999), then Craddy Pitchers Davidson (2006), now Craddys |
| Crocker, Trevor | Burrow Crocker, then DHV Consulting (c. 1991-2) |
| Crockett & Associate | Civil Engineering Dynamics Ltd (1989) |
| Crouch & Hogg | Crouch Hogg Waterman, then (1997) Halcrow Waterman (structures) and Halcrow + Crouch (civil engineering) |
| Cuthbertson, R H | Cuthbertson Maunsell (1999), part of Balfour Maunsell, then FaberMaunsell, now Aecom |
| Dames & Moore | URS |
| Davies, Richard Associates | Robert Benaim |
| Davis Langdon | Bought by Aecom (2010) |
| De Leuw Chadwick | De Leuw Knight Piesold, now Pell Frishmann |
| Deakin Callard | merged with Jon Walton Associates to form Deakin Walton (1999). Scottish office of Deakin Callard sold to the incumbent partner and relaunched as Goodson Associates. Deakin Walton acquired by the Clarke Bond Group (2008) and relaunched as Clarke Bond (2010) |
| Design & Construction Unit, British Rail (Birmingham) | Owen Williams (1995) |
| Design Group Partnership | DGP International, purchased by Scott Wilson (2006) |
| DGP International | Purchased by Scott Wilson (2006) |
| DHV International | company still active worldwide but UK office in liquidation |
| Dixon Hurst | merged with Redgrove & Kemp to form Dixon Hurst Kemp (1997) |
| Dobbie | Babtie (1990) |
| Dobbie, C H | Dobbie & Partners (mid 1980s), then Babtie Dobbie (1987), then Babtie (1990) |
| Donaldson Associates | COWI (2014), took COWI name in 2017 |
| Donkin | Kennedy and Donkin |
| Doran, Dr I G | Doran Consulting |
| Douglass, Lewis and Douglass | see Lewis Duvivier |
| Durley Hill | merged with Cameron Taylor Bedford to form Cameron Durley Consulting (1999) |
| Earley Campling Lee | White Young |
| Elliott & Brown | Acquired by Waldeck (2010) |
| Elms Rooke | Geoff Rooke now a director of the Terrell Group |
| Engineering Geology | Acer (1993), then Hyder (1996) |
| ERL | Merged with ERM (1987) |
| Evans Grant | Evans Grant Opus (2004), merged with Veryards Opus to form Opus International Consultants (2006) |
| Evans, Wallace | Bought by Welsh Water (1990), merged with Acer as Acer Wallace Evans (1993), then Hyder (1996) |
| Ewbank | merged with Preece Cardew & Rider to become Ewbank Preece (1983) |
| Ewbank Preece | Mott MacDonald (1994) |
| Faber, Oscar | Merged with AECOM Maunsell (2001) to become FaberMaunsell, then AECOM FaberMaunsell, now AECOM |
| Ferguson McIlveen | Scott Wilson (2006), retains name |
| Flint & Neill | Merged with COWI (2008), took COWI name in 2017 |
| Fluid Structures | Merged with MLM (2016) |
| Flynn & Rothwell | De Leuw Chadwick, De Leuw Knight Piesold, now Pell Frischmann |
| FMH Consulting | acquired by SLR (2008) |
| Fordham Johns | Cameron Taylor |
| Foster Wheeler | Bought by Amec (2014); Amec Foster Wheeler bought by Wood Group (2017) |
| Fox, Douglas | Freeman Fox |
| Freeman Fox | merged with John Taylor to form Acer Group (1987), then Hyder Consulting (1996) |
| Gathard Brooke | Bettridge Turner (2004) |
| Genivar | Merged with WSP (2012), trading as WSP from 2013 |
| Geotechnical Consultants | Wilkinson Assoiciates then part of Tony Gee & Partners (2003) |
| GHA Livigunn | Merged with Birkett Stevens Colman Partnership (2009, both retain name) |
| Gibb, Sir Alexander | Law Group (US), Jacobs Gibb (2001), Jacobs (2002), then Jacobs Babtie (2004) |
| Gifford | Purchased by Ramboll (2011) |
| Gower Associates | Babtie (1990s) |
| Graham Group | WSP Group plc (1997) |
| Graham, Frank | Graham Group |
| Gray & Hurst | B L Hurst left partnership in 1910 (see Hurst, B L). C W Gray in practice until 1922. |
| Green, Ernest | White Young Green (1997) |
| Gregory & Associates | BCSP (1997) |
| Grontmij | Bought by Sweco (2015) |
| Grove Consultants | Tarmac Professional Services (TPS) (1995), then Carillion |
| Gunn & Colthart | merged with Leslie Plummer Associates (2005) |
| HAC (2006) | |
| Haiste Group | Carl Bro (1988), subsequently Grontmij |
| Halcrow | Purchased by CH2M Hill (2011); CH2M purchased by Jacobs (2017) |
| Hallam, Michael | Hallam, Alexander (1996), then Alexander Associates (2004) |
| Hannah, Reed | |
| HAP | |
| Harris & Sutherland | Babtie Harris & Sutherland (1997), then Babtie, Jacobs Babtie (2004), Jacobs (2006) |
| Harris, A J & J D | Harris and Sutherland (c1964) (qv) |
| Harris, E C | Acquired by Arcadis (2011) |
| Haswell, Charles | Haswell Consulting, then (2005) taken in-house by Severn Trent |
| Hawksley, T and C | Amalgamated with J D and D M Watson to form Watson Hawksley (1978), merged with James M. Montgomery to form Montgomery Watson (1990), merged with Harza Engineering Company to form Montgomery Watson Harza (2001), shortened to MWH (2003) |
| Hay Barry | Acer, then Hyder Consulting (1996) |
| Henderson, L N | L N Henderson, Morgan (1978) |
| Hill, G H | Closed down following 1984 Carsington Dam failure |
| HJT | WSP Group plc (1999) |
| Holman, Davis | Mander, Raikes and Marshall (1986), then MRM |
| Howard Humphreys | Brown & Root, Halliburton, Kellogg Brown & Root, now KBR |
| Hunt, Anthony | YRM Anthony Hunt, then Kendall, then SKM Anthony Hunts |
| Hunter and Dunn | |
| Hurley Palmer Flatt | Acquired by HDR (2019) |
| Hurst, B L | B L Hurst & Peirce (1935), then Hurst Peirce & Malcolm (1947) |
| Husband | Mott MacDonald |
| Hutchinson, George Associates | Merged with Livingston Gunn to form GHA Livigunn |
| Hyder | Acquired by Arcadis (2014) |
| Infrastructure Design Group, British Rail (Glasgow) | Scott Wilson Kirkpatrick (1995) |
| Ingram, L.V. | Closed down (2005) |
| Irendco | High-Point Rendel |
| Jacobs Babtie | Jacobs (2006) |
| James, Harold | Merged with T A Millard (2005) |
| James, R T (London office) | Owen Williams (1996), now Amey (2006) |
| James, R T (Newcastle upon Tyne office) | WSP Group plc (1995) |
| James-Carrington & Partners | Acquired by Kenchington Little (c1990), then WSP Group (1995) |
| Johnston, Sinclair | Acquired by ByrneLooby (2017) |
| Joynes Pike | Acquired by Opus International Consultants (2008) |
| Kanthack, F E | WLPU, then Knight Piesold (1990), then Pell Frischmann |
| Kara Taylor | Adams Kara Taylor (1997) |
| Kenchington Ford | WSP Group plc (1993) |
| Kenchington Little | Kenchington Ford (owned by A B Consulting), then WSP Group plc (1993) |
| Kennedy & Donkin | Rust (1994), then Parsons Brinckerhoff (1998) |
| Kinnear & Gordon | Merged with R H Cuthbertson (1991), then Cuthbertson Mausell (1999), part of Balfour Maunsell, then FaberMaunsell, now Aecom |
| Kirk McClure Morton | RPS Kirk McClure Morton (2004) |
| Kirkpatrick, J A | Carl Bro (1990) |
| KML Consulting | Carl Bro (1993) |
| Knight Morrish | Morrish and Partners (1999) |
| Knight Piesold | Pell Frischmann |
| Knowles. James R | Knowles, then acquired by Hill International (2006) |
| Leonard & Partners | Brand Leonard (1985?) |
| Lewis & Lewis | see Lewis and Duvivier |
| Lewis and Duvivier | A.W. Lewis was the last assistant of William Tregarthen Douglass, son of the lighthouse engineer Sir James Nicholas Douglass. When W.T. Douglass died his son Cuthbert became head of the firm in partnership with Lewis to become Douglass, Lewis & Douglass (1914). When Cuthbert was killed in WW1 the firm became Lewis & Lewis (1918), then Lewis & Duvivier (1942). It merged with Posford Pavry to form Posford Duvivier (1987), incorporated T F Burns and Partners (1992) and was acquired by Royal Haskoning (1994), becoming Posford Haskoning (2001) then Royal Haskoning (2005) |
| Livesey & Henderson | Binnie, now Black & Veatch (2003) |
| Lowe & Rodin | Merged with Building Design Partnership (1970 |
| Macdonald, F A | W A Fairhurst (1963) |
| MacDonald, Sir M[urdoch] & Partners | Mott MacDonald (1989, with Mott, Hay & Anderson) |
| Maddocks and Lusher | Maddocks, Lusher and Matthews (MLM) (1973) |
| Maggs & Keeble | see Brimer, Andrews & Nachsen |
| Mainline Railway Infrastructure Consultants, British Rail (Swindon) | Scott Wilson Kirkpatrick (1995) |
| Malachi Cullen | White Young Green (2007) |
| Mander Structural Design | Integral Structural Design (2005, with Pilotis) |
| Mander, G C | Mander, Raikes & Marshall (1973) |
| Mander, Raikes & Marshall | MRM, then Rust (a subsidiary of Rust International), then Rust Environmental, now Parsons Brinckerhoff |
| Marsh, John Associates | merged with Sinclair Johnston (1998) |
| Marshall, Alan | Frank Graham, then Graham Group, then WSP Group plc (1997) |
| Massie Reid | Goodson Associates (2014) |
| Matthew Consultants | Walsh Group |
| Maunsell, G | Maunsell, acquired by Aecom (2000), became FaberMaunsell (2001) |
| Maunsell, G A | Founded by Guy Maunsell and John Posford (early 1940s), then Maunsell, Posford and Pavry (1949). Firm split to form Posford Pavry and Partners (1955), incorporated W H Radford & Son (1983), merged with Lewis and Duvivier to form Posford Duvivier (1987), incorporated T F Burns and Partners (1992), acquired by Royal Haskoning (1994), Posford Haskoning (2001), Royal Haskoning (2005) |
| McCathie Associates | Babbé McCathie Partnership (2014) |
| MCD Consult | White Young Green (2001) |
| McDowells | Closed down (1996) |
| McEwan, Alan, Associates | AMA Consulting (2013) |
| McGregor Associates | McGregor McMahon |
| McKelvey Ellis Partnership | Merged with Keith Pearson Associates to become Pearson Ellis Partnership (1991), then PEP Ltd (1994), then PEP Civil & Structures Ltd (1996) |
| McKelvey, K K | McKelvey Ellis (1971) (qv) |
| McLellan, William | Established in 1927 when McLellan was a partner with Charles Merz in Merz and McLellan. He continued that association as he wanted a firm that could specialise in industrial work as opposed to the power generation and transmission work of Merz and McLellan. Merged with Morris and Sons (2004) and operates now as McLellans. |
| McMahon Associates | Nickalls Roche McMahon (1979) then NRM Consultants |
| Meik | Halcrow |
| Mentor, a Cooper Macdonald geotechnical subsidiary | Mentor |
| Merz & McLellan | Parsons Brinckerhoff (1994) |
| Metro Consulting | Mouchel (2001) |
| Ministry of Works | Until 1940 the Office of Works. Merged with the works branches of the armed services (1960s)and subsequently became the Property Services Agency (1972) |
| Mitchell, McFarlane | When the W V Zinn Practise splintered in 1969 the two senior partners, Jack Mitchell and Ian McFarlane formed their own practice Mitchell McFarlane and Partners. Hong Kong Office Mitchell, McFarlane, Brentnall & Partners (opened 1972) taken over by WSP Group (2000) |
| Modus | Sinclair Knight Merz (Europe) Ltd (1999) |
| Montgomery Watson | Merged with Harza Engineering Company to form Montgomery Watson Harza (2001), shortened to MWH (2003) |
| Montgomery, James M | Merged with Watson Hawksley to form Montgomery Watson (1990), merged with Harza Engineering Company to form Montgomery Watson Harza (2001), shortened to MWH (2003) |
| Moorehead Clancy Associates | formed 1969, separated (1972) to form Brian Moorehead & Partners and Brian Clancy Partnership, then Clancy Consulting (2000). Brian Moorehead & Partners ceased trading 1992, the Manchester office becoming Consultants BMP, then Modus, then Sinclair Knight Merz (Europe) Ltd (1999), the London Office becoming BMP Consulting Engineers (dissolved 1993), then R & H Moorehead (1992), then Ramboll Moorehead (dissolved 2005) |
| Morley, Stephen Partnership | SMP Atelier One (1994, with Atelier One) |
| Morton, Brian A and Partners | The Morton Partnership (1992) |
| Mott & Hay | Mott, Hay and Anderson (1920) |
| Mott, Hay & Anderson | Mott MacDonald (1989, with Sir M[urdoch] MacDonald) |
| Mouchel, L G | Mouchel Parkman (2003), then Mouchel Group, sold to Kier (2015), Mouchel Consulting sold to WSP (2016) |
| MRM | see Mander, Raikes & Marshall |
| Mulholland & Doherty | Acquired by Faber Maunsell (2008) |
| Nachshen, Crofts & Leggatt | NCL Consulting Engineers, then Project Engineering Partnership, NCL Stewart Scott Ltd, then NCL St James Ltd (part of St James Consultants), then St James Lovell Partnership (closed down 2007). Information available from Pinfold Consulting. |
| Newsum, H and Sons | also known as HNS. Taken over by Dexion and relaunched as Newsum Timber Engineering (NTE) |
| Nickalls and Roche | acquired McMahon Associates (1979), Cook White Partnership (1998) and Cameron Holdsworth (2003) to become Nickalls Roche McMahon and then NRM Consultants. Merged with Jan Bobrowski to become NRM Bobrowski (2004). NRM Bobrowski acquired by Capita Symonds to become Capita Bobrowski (2008) |
| Nickson Davis | Merged with T D Bingham to become Bingham Davis (2006) |
| Nolan, John Associates | Acquired by Erinaceous Group (2006), now Nolan Associates |
| Norman & Dawbarn | Capita Norman + Dawbarn (2005) |
| Northcroft | Acquired by Capita Symonds (2012) |
| NRM Consultants | NRM Bobrowski (2004). NRM Bobrowski acquired by Capita Symonds to become Capita Bobrowski (2008). See Nickalls and Roche |
| Osprey | Osprey Mott MacDonald |
| O'Sullivan, M C (MCOS) | Acquired by RPS Group (2002) |
| Parkman | Mouchel Parkman (2003), now Mouchel Group |
| Parsons Brinckerhoff | Acquired by Balfour Beatty (2009), sold to WSP Group (2014) |
| Parsons, Brown | now part of WSP Group |
| Parsons, Brown and Newton | now part of Mott MacDonald |
| Pattisson, John | Evans Grant Opus (2004) |
| Pearlstone Gilbey Cole Partnership | Merged with A F Roessler & Associates to become PGC-Roessler Partnership. Purchased by PGCS Partnership (2008) |
| Pearlstone Gilbey Partnership | Merged with C W Cole Associates to form Pearlstone Gilby Cole Partnership which merged with A F Roessler & Associates to become PGC-Roessler Partnership. Purchased by PGCS Partnership (2008) |
| Pearson, Keith Associates | Merged with McKelvey Ellis & Partners to become Pearson Ellis Partnership (1991), then PEP Ltd (1994), then PEP Civil & Structures Ltd (1996) |
| Peel and Fowler | Scott Wilson (2002) |
| Pell, C J | Pell Frischmann |
| Pencol | Penspen Group |
| Peter Brett Associates (2014) | |
| Pettit | Mott MacDonald Pettit (2006) |
| PGC-Roessler Partnership | Purchased by PGCS Partnership (2008) |
| Pilotis | Integral Structural Design (2005, with Mander Structural Design) |
| Posford Duvivier | A.W. Lewis was the last assistant of William Tregarthen Douglass, son of the lighthouse engineer Sir James Nicholas Douglass. When W.T. Douglass died his son Cuthbert became head of the firm in partnership with Lewis to become Douglass, Lewis & Douglass (1914). When Cuthbert was killed in WW1 the firm became Lewis & Lewis (1918), then Lewis & Duvivier (1942). It merged with Posford Pavry to form Posford Duvivier (1987), incorporated T F Burns and Partners (1992) and was acquired by Royal Haskoning (1994), becoming Posford Haskoning (2001) then Royal Haskoning (2005) |
| Posford Pavry | Incorporated W H Radford & Son (1983), merged with Lewis and Duvivier to form Posford Duvivier (1987), incorporated T F Burns and Partners (1992), acquired by Royal Haskoning (1994), Posford Haskoning (2001), Royal Haskoning (2005) |
| Preece Cardew & Rider | merged with Ewbank to become Ewbank Preece (1983) |
| Property Services Agency (PSA) | Set up in 1972. Privatised in 1989 and split into the three divisions - PSA Projects, PSA Building Management and PSA International. PSA Projects acquired by Tarmac Construction (now Carillion) as TBV Consult (1992) and renamed TPS (1998) |
| Pryke, John | HLN (2012) |
| PSA Projects | Acquired by Tarmac Construction (now Carillion) as TBV Consult (1992) and renamed TPS (1998) |
| Radford, W H | Incorporated into Posford, Pavry and Partners (1983) |
| Redgrove & Kemp | merged with Dixon Hurst Partnership to form Dixon Hurst Kemp (1997) |
| Rendel Palmer & Tritton | High-Point Rendel (1995) |
| Rendel Palmer & Tritton (Scotland) | High-Point Rendel, then Cadogan Consulting (1997) |
| Roessler, A F & Associates | Merged with Pearlstone Gilby Cole Partnership to become PGC-Roessler Partnership. Purchased by PGCS Partnership (2008) |
| Rofe Kennard & Lapworth | Arup |
| Roscoe, Edward Associates | Capita Roscoe (1999) |
| Ross Silcock | Babtie (2001) |
| Roughton & Fenton | Acer, then Hyder Consulting (1996) [not to be confused with Roughton Group] |
| Roxburgh Associates | Merged with Will Rudd Associates to form Will Rudd Roxburgh (2000) |
| RT-W | changed name to Structural & Civil Consultants (1998) |
| Rudd, Donald | WSP Group plc (1990) |
| Safier, Armand | |
| Sale, William | Acer (1989), then Hyder (1996) |
| Sampson | acquired by W A Fairhurst (1997) |
| Saunders, William & Partners | William Saunders Partnership (c1990), then William Saunders Partnership LLP (2004). Also trades as WSP, not to be confused with WSP Group plc |
| Scott Wilson | Bought by URS (2010), URS bought by Aecom (2014) |
| Scott Wilson Kirkpatrick | Scott Wilson |
| Severn, Kenneth | Halcrow Severn (1993) |
| Sinclair Knight Merz (SKM) | Acquired by Jacobs (2013) |
| Sloma, The, Partnership | Robert Sloma died in 1996. His partner Alan McEwan continued the practice as Alan McEwan Associates, merged with C & R Design Ltd to become AMA Consulting (2014) |
| Snow, Sir Frederick | Merged with Athens-based Associated Consulting Engineers (1991), acquired oil and gas consultants IMEG (2003) |
| Stevenson, Robert | R Stevenson & Son, then T & A Stevenson, then D Stevenson, then D A Stevenson (wound up c1960) |
| Stroyer & Adcock | Active 1913-1986 |
| Sturrock, J C | Acquired by Hannah-Reed (2007) |
| Sweett | Acquired by Currie & Brown (2016) |
| TALL | Joined Entuitive (2016) |
| Tanner, John A & Partners | Tanner Sadler Partnership (c1990), dissolved (1994), then Tanners (until 1999) |
| Taylor Whalley Spyra | Acquired by Simpson Associates (2019) |
| Taylor, John | merged with with Freeman Fox to form Acer Group (1987), then Hyder Consulting (1996) |
| Taylor, R G, Hodgkinson | Taylor, R G (1978) |
| TBV Consult - PSA Consult | Now part of Carillion |
| Thomasons | Rebranded as Perega (2019) |
| Thorburn | Thorburn Colquhoun (c1993-4, with Colquhoun), URS (1999) |
| Tietz, S B | Briefly in partnership as Cadogan Tietz (c1996-1999); still operates, also as Tietz Management Ltd (TML) |
| Tilney Simmons | White Young Green (1999) |
| Trant Brown and Humphreys | Howard Humphreys |
| Travers Morgan, R and Partners | Travers Morgan Ltd (late 1980s), then Symonds Travers Morgan (1995), then Capita Symonds (early 2000s) |
| Turner, Peter & Associates | John Pryke (2005) |
| Tweeds | Acquired by White Young Green (2006) |
| Underwood & Mander | Existed from 1949-1959, separated into E N Underwood & Partners (1959-1976) and G C Mander (1959-1973); D C Mander founded in 2000 |
| Underwood, E N | 1946-1949, then Underwood & Mander (1949-1959), then E N Underwood & Partners (ceased trading 1976) |
| URS | Acquired by Aecom (2014) |
| Veryards | Veryards Opus (2005), merged with Evans Grant Opus to form Opus International Consultants (2006) |
| Walker, Brian | Beers |
| Wallace Evans | Acer, then Hyder Consulting (1996) |
| Walton, Jon Associates | formed 1969, merged with Deakin Callard to become Deakin Walton (1999). Walton Garden & Partners formed (1980), the Scottish office of John Walton Associates, incorporated into Walton Garden Ltd (2003), owned by Goodson Associates |
| Ward Ashcroft Parkman | Parkman, then Mouchel Parkman |
| Ward, Anthony | Merged with Andrews, Kent and Stone to become AKS Ward (2005) |
| Ward, John & Partners | Beers |
| Ward, R.D. | |
| Warnock, J C | White Young Green Ireland (2006) |
| Warren and Partners | taken over by R.H. Cuthbertson, now Aecom |
| Waterman Group | Acquired by CTI Engineering (2017) |
| Waterman, H L | Waterman Partnership (1986), then Waterman Group, Acquired by CTI Engineering (2017) |
| Waters, A H S and Partners | Acquired by Mott, Hay & Anderson (1985) |
| Watson Hawksley | Merged with James M. Montgomery to form Montgomery Watson (1990), merged with Harza Engineering Company to form Montgomery Watson Harza (2001), shortened to MWH (2003) |
| Watson, J D and D M | Amalgamated with T and C Hawksley to form Watson Hawksley (1978), merged with James M. Montgomery to form Montgomery Watson (1990), merged with Harza Engineering Company to form Montgomery Watson Harza (2001), shortened to MWH (2003) |
| Weiss, Charles & Partners | Charles Weiss Partnership (1986), then Ernest Green, then White Young Green (1997) |
| Whitby Bird | Ramboll WhitbyBird (2007), then Ramboll UK (2009) |
| White Young | White Young Green |
| White, Robert | see Wolfe Barry |
| White, Sir Bruce, Wolfe Barry | see Wolfe Barry |
| Wilkinson Associates | Became part of Tony Gee & Partners (2003) |
| William Sale Partnership | WSP Group plc (1993) |
| Williams, Owen | Acquired by Amey (2006), name no longer used (2008) |
| Williamson, James | Formed in 1947, dissolved and merged with Mott MacDonald (1989) |
| Willis & Partners | Willis Caldwell (2004), then WCL St James |
| Willis Caldwell | WCL St James |
| Willis, Septimus | Dissolved (c1980) |
| Wimpey | Interchange with Tarmac, became Carillion |
| WLPU | Knight Piesold (1990) |
| Wolfe Barry | John Wolfe Barry and Henry Brunel in practice as Barry and Brunel (1878). Sir George Barclay Bruce and Robert White set up as partners (1888). John Wolfe Barry’s nephew A.J. Barry and Bradford Leslie in partnership as Barry and Leslie (1901), becoming A.J. Barry and Partners (1906). Sir George Barclay Bruce dies and Robert White continues alone (1908) until Robert White takes his son Bruce White and Cyril Hitchcock into partnership as Robert White and Partners (1919). Robert White and Partners amalgamate with John Wolfe Barry and Partners to become Wolfe Barry, Robert White and Partners (1941). After A.J. Barry dies, J.A. Cochrane continues as the sole principal of A.J. Barry, Cochrane and Partners (1944). Following the war the above firms merge to become Sir Bruce White, Wolfe Barry and Partners until a merger with Acer Consultants to become Acer Sir Bruce White (1991), then Welsh Water (1993), then Hyder (1996) |
| Woods Warren | RPS Woods Warren (2003), then RPS Design (2005) |
| WSP | bought by Genivar (2012) |
| Yorkshire Water Engineering | Babcock Water Engineering (1991), then Earth Tech Engineering (1998) |
| Zinn, W V Associates | Bill Zinn retired in 1969 with the regional offices going their own ways - two senior partners, Jack Mitchell and Ian McFarlane formed their own practice Mitchell McFarlane and Partners; W V Zinn & Partners for Birmingham area projects (c1970); Manchester office became Deakin Callard (1969); Scottish office became Zinn Hunter, then Woolgar Hunter (c1971); remainder to Cooper Macdonald & Partners (dissolved c1993) |
| Zukas Magasiner Green | ZMG Consulting Engineers, Zukas Magasiner Green, Zukus Magasiner Green Lewin, Zukus Magasiner Coppen, Zukas and Magasiner and AS Magasiner were all transferred to Sir M MacDonald and Partners (1987), then Mott MacDonald (1989). ZMCK formed in 1982 by a merger of ZMG and MCMK Consulting Engineers. |
| Zukas, Simon | Zukas Magasiner Green, then ZMCK (1982) |