Written question asked by James Cartlidge (Conservative) on Wednesday, 4 June 2025, in the House of Commons. It was due for an answer on Monday, 9 June 2025 (named day). It was answered by Luke Pollard (Labour) on Monday, 9 June 2025 on behalf of the Ministry of Defence.

Chagos Islands: Sovereignty

Question: To ask the Secretary of State for Defence, with reference to Article 11, Clause 1 of the UK/Mauritius: Agreement concerning the Chagos Archipelago including Diego Garcia [CS Mauritius No.1/2025], what the annual sum paid to Mauritius is in cash terms.

Answer: The schedule of payments is set out in the finance exchange of letters that was published alongside the treaty. The estimated average annual payment value is £101 million over the initial 99-year period of the treaty. This has been calculated using the standard formula set out in the Green Book that the government uses for all long-term projects. These calculations have been agreed by the Government Actuary’s Department. The full details are in the Explanatory Memorandum laid alongside the Treaty.

Secondary information

Type: Written question
Reference: 57308
Session: 2024-26
Related items: Chagos Islands: Sovereignty
Thursday, 26 June 2025
Written questions
House of Commons
Subjects: Finance Mauritius Sovereignty Chagos Islands
Contains statistics: Yes
Link: View this Written question on www.parliament.uk