To ask the Secretary of State for Defence what are the cumulative net present values for the Portland and Devonport options in the investment appraisal which supported his Department's decision to close Portland naval base; and what is the difference between these options.

I refer the hon. Member to the investment appraisal figures given in annex A of the Portland naval base consultative document, a copy of which was placed in the Library of the House on 12 November 1992.