To ask the Prime Minister what changes to security considerations underlay the decision to make a 20 per cent. reduction in the operationally available nuclear warheads on Trident set out in his foreword to the White Paper on “The Future of The United Kingdom’s Nuclear Deterrent”,Cm 6994. (105218)

I refer the hon. Member tomy statement of 4 December 2006, Official Report, columns 21-24.