The UK has agreed to hand over the Chagos Islands to Mauritius, ending years of bitter dispute over Britain’s last African colony.

The UK expelled the Chagossians in the 1960s and 1970s, in what has been described as a crime against humanity, when it retained possession of what it called the British Indian Ocean Territory, or BIOT, after Mauritius gained independence in 1968.

The agreement follows rounds of negotiations that began in 2022 after Mauritian arguments for sovereignty were recognised by the international court of justice (ICJ), the UN general assembly and the international tribunal of the law of the sea (Itlos) in 2019 and 2021.

Britain was found to have unlawfully separated the Chagos Islands from Mauritius before granting independence in 1968. The UK initially defied UN votes and court judgments demanding it return the islands, emphasising that the ICJ ruling was only an “advisory opinion”.

An attempt to halt the negotiations, on the basis that the Chagossians were not consulted or involved, failed.