I refer the hon. Member to the answer I gave on 17 December 2008, Official Report, column 766W, to the hon. Member for New Forest, East (Dr. Lewis).
[holding answer 18 December 2008]: We have estimated the costs of a delay to in-service dates in close consultation with the Aircraft Carrier Alliance and other stakeholders. Further negotiations with industry will be necessary to reach a firm figure and I am therefore withholding this information as its release would, or would be likely to, prejudice commercial interests.