Britain signed the Chagos archipelago back to Mauritius on May 22, 2025, but the treaty exists only on paper. The UK government admitted in April that implementing legislation could not complete its passage during the 2024–26 parliamentary session, which ended April 29. The bill is dead until reintroduced. Meanwhile, the people whose lives depend on it are dying. The architecture of delay has three load-bearing walls. First, Donald Trump publicly attacked the deal in January, calling it "an act of great stupidity" and questioning whether the Diego Garcia military base—jointly operated by the US and UK—was adequately protected. Second, the UK parliament simply ran out of legislative calendar, a bureaucratic failure that effectively vetoed a signed international agreement. Third, Mauritius has kept the substance of ongoing talks almost entirely private, disclosing little beyond sovereignty-is-non-negotiable boilerplate. On September 26, Mauritian Prime Minister Navin Ramgoolam travelled to London for talks with British National Security Adviser Jonathan Powell. He remains in London. The Mauritian government said discussions would cover "recent developments concerning the archipelago"—a phrase that communicates nothing. British PM Andy Burnham said on September 21 that the UK would work with Mauritius and the US on a path forward that "secures the operation of Diego Garcia and protects UK national security." The base, not the people, remains the organizing concern. The displaced Chagossians are split across Mauritius, the Seychelles, and the UK. Between 1968 and 1973, Britain removed an estimated 1,400 to 1,700 people from the islands and made it illegal to return. Those born on the archipelago are now aged 58 to 100. Olivier Bancoult of the Chagos Refugees Group reports losing several elders this year alone and hopes to celebrate one member's 101st birthday. The group travelled to the UK in June to lobby political parties—all except Reform UK, which backs a rival faction favouring British sovereignty. That factional split is itself a product of the displacement. Chrisyl Wong-Hang-Sun, a PhD researcher at the University of Edinburgh, notes that the diaspora holds "very nuanced and differing political opinions." UK-based second-generation Chagossian Misley Mandarin and his supporters favour resettlement under British rather than Mauritian sovereignty and have received backing from Reform UK. Wong-Hang-Sun argues both governments need to "find ways to prioritise and engage with the Chagossian diaspora as a whole." Neither has. The Diego Garcia question remains the fulcrum. The treaty would grant the UK rights to the base for an initial 99-year period while Mauritius exercises sovereignty. Lalit, a Mauritian political organisation, opposes the base entirely, warning that Mauritius could become a military target. Lindsey Collen of Lalit also flagged a new partnership between the Mauritius Police Force and the New Mexico National Guard, and what she described as the "enormous military-looking buildings" of the new US embassy in Mauritius. International relations consultant Bruno Donat argues the treaty could give Mauritius leverage over base operations, noting Mauritius publicly stated that strikes launched from Diego Garcia against Iran breached international law. The 2019 ICJ advisory opinion, the 2021 International Tribunal for the Law of the Sea judgement, and the 2025 treaty all support Mauritian sovereignty. International law is not the obstacle. Political will distributed across three capitals is. Every month of delay narrows the population of living Chagossians who could exercise a right of return. The treaty's promises are depreciating assets, and the principal losers have no seat at any of the tables where their fate is being decided.
