Whilst I am a firm believer in the economy obtained by the intelligent use of grade 50 steel, the submission by Mr. Needham that the present cost differential is an extra £3.50 per tonne compared with grade 43 steel is somewhat misleading. This figure is applicable only when comparing the cost of grade 43A steel with that of grade 50A steel, and is thus limited only to certain rolled sections. Significant economy by the use of grade 50 steel with rolled steel sections is doubtful, especially where deflection is the criterion. When using structural hollow sections in lattice construction, where the maximum economy in weight is possible, it is necessary to compare the cost differential between grade 43C and grade 40C. This is, I am given to understand, as much as 50 per tonne depending on the sections used.