asked the Secretary of State for Scotland what was the amount of the original estimated costs submitted by the consulting engineers and the estimated costs submitted by the main civil engineering firm for the modernisation of Dalmarnock Sewage Purification Works, Glasgow; and what is the amount of the revised estimated costs in each case.

Glasgow Corporation tells me that the estimate in the consulting engineers' report, dated May 1960, was £3 million comprising £2·25 million for construction and £0·75 million for equipment; that the original tender for the construction works was £2·19 million; and that the latest available estimated cost of the scheme is £3·56 million, £2·35 million of which is in respect of construction.