Question to the Foreign, Commonwealth & Development Office:

To ask the Secretary of State for Foreign, Commonwealth and Development Affairs, if he will publish all the estimates he received on the financial costs of the UK-Mauritius Treaty from the Government Actuary's Department since 5 July 2024.

The cost of the Diego Garcia military base agreement in today's money is £101 million while the net present value over 99 years is £3.4 billion. These figures have been verified by the Government Actuary's Department and draw on long-established methodology to account for long-term projects. Full details are in the Explanatory Memorandum which was laid alongside the Treaty.