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British Indian Ocean Territory: Sovereignty

Question for Foreign, Commonwealth and Development Office

UIN 54794, tabled on 30 May 2025

To ask the Secretary of State for Foreign, Commonwealth and Development Affairs, with reference to the Agreement between the Government of the United Kingdom of Great Britain and Northern Ireland and the Government of the Republic of Mauritius concerning the Chagos Archipelago including Diego Garcia, CP 1334, what estimate his Department has made of the monetary value of each payment in cash terms to be made in each year of the agreement.

Answered on

9 June 2025

As stated in the Explanatory Memorandum, the average annual cost to the UK during the initial 99-year period of the treaty is £101 million in 2025/2026 prices.