To ask the Secretary of State for Defence what long-lead items for the fourth Trident submarine are under construction; how much money has been spent on them; and under what parliamentary vote the money has been committed.

Construction of steelwork and engineering items, including hull units, sub-frames, bulkheads and pumps has started under long lead funding arrangements. Expenditure to December 1991 was £138 million. Submarine construction is appropriated to Ministry of Defence vote 2F.