The islands’ inhabitants were initially moved to Mauritius and the Seychelles, where many of them still live. In 2002 Britain granted citizenship to those born in Chagos, and to their children; in 2022 their descendants were included, too. Around 3,000 Chagossians already live in Crawley, close to London’s Gatwick airport; authorities there are braced for up to 5,000 more to arrive now that citizenship has been offered more widely. But Britain has repeatedly denied their right to return to Chagos. That position, and Britain’s claim to the islands, have become ever harder to sustain.
In 2017 the United Nations voted to refer to the International Court of Justice (ICJ) a case that questioned whether Britain’s decolonisation of Mauritius was complete. Only 15 countries backed Britain. In 2019 the ICJ issued an advisory opinion stating that Britain’s continued administration of Chagos constituted a “wrongful act”, and that it had an obligation to end it ”as rapidly as possible”.
In 2021, adjudicating in a dispute between Mauritius and the Maldives, the International Tribunal on the Law of the Sea argued that “Mauritius’s sovereignty over the Chagos Archipelago can be inferred from the ICJ’s determinations”. The UN has amended its official map of the world, which since 2020 has shown Chagos as an undisputed part of Mauritius. The issue is an irritant in other contexts. When British diplomats tried to drum up support in response to Russia’s invasion of Ukraine, African leaders questioned why Britain should have the right to dislodge Russian forces while illegally occupying Chagos.
Britain has said in the past that it would cede sovereignty only when Diego Garcia is no longer needed for defence purposes. But the government’s line is shifting. In September, during her brief stint as prime minister, Liz Truss met with Pravind Jugnauth, the prime minister of Mauritius. In November the foreign secretary, James Cleverly, announced that Britain would resolve the “exercise of sovereignty” over the Chagos “on the basis of international law”.