Oral question asked in the House of Commons, by Lord Walney (Labour). It was answered on Monday, 8 November 2010 on behalf of the Ministry of Defence.

Trident Replacement

Question: The Secretary of State has said on many occasions that delays in defence contracts end up costing the taxpayer more. Will he say how much extra cost will be incurred by the delay to the Trident programme and the stretching out of the Astute drumbeat that that has necessitated?

Answer: The hon. Gentleman is at least partly correct. There will be additional costs to maintaining the Vanguard class through to 2028. We expect those to be around £1.2 billion to £1.4 billion extra to maintain those submarines for longer. However, his analysis would be far more correct if the ultimate decision to delay the in-service date increased the cost of the successor programme. As no cost will be set out until after main gate, it is impossible to make that assumption.

Secondary information