Mrs. Cryer: To ask the Secretary of State for Defence how many US nuclear warheads are based in the United Kingdom; when he last discussed with the US authorities their withdrawal of warheads from the UK; and if he will make a statement. 
Des Browne: I refer my hon. Friend to the answer I gave on 7 July 2008, /Official Report,/ column 1154W, to the hon. Member for Portsmouth, South (Mr. Hancock). It is not the practice of the Government to make public details of all discussions with foreign Governments as this would, or would be likely to, prejudice international relations.
Vanguard Class Submarines
Mr. Gerald Howarth: To ask the Secretary of State for Defence what the /(a)/ unit cost and /(b)/ date of commissioning of each Vanguard Class submarine was. 
Mr. Bob Ainsworth: The commissioning dates for the four Vanguard class submarines are listed in the following table.
/Submarine/ /Date commissioned/
21 August 1993
7 January 1995
2 November 1996
27 November 1999
The total procurement cost for the four submarines was £3,587 million, which equates to approximately £897 million per submarine.