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Verulam

Factors of safety in Codes Alasdair Bed, from Leeds, has returned to the fray and writes: Colin Taylor’s invitation (Verulam, 16 September) to a game of pingpong with him and Alan Weller is tempting (if we could find a suitably shaped table!), but the correspondence on the derivation of the BS 5950 safety factors had a rather more serious purpose.