As I explained to the hon. Member for North Devon (Nick Harvey) on 6 March 2007, Official Report, column 1877W, the estimate of in-service support costs of the UK's nuclear deterrent set out at paragraph 5-14 of the White Paper, “The Future of the United Kingdom's Nuclear Deterrent” (Cm 6994), includes an allowance for the decommissioning of a successor to the current system. At this very early stage, we are not in a position to provide figures in the way requested.
In 1995, the UK announced that it had ceased production of fissile material for weapons purposes. This moratorium remains in place, and we do not envisage any requirement to change this position.
The UK's current warhead design is likely to last into the 2020s, and decisions on whether and how we may need to refurbish or replace it are likely to be necessary in the next Parliament.