evidence: A boat sent by the government of Mauritius has arrived in the disputed Chagos archipelago in the Indian Ocean, after the country accused the occupying British authorities of "crimes against humanity". The United Nations' highest court has ruled that Britain's occupation of the islands is illegal, but Britain has refused to hand control to Mauritius. Our Africa correspondent Andrew Harding reports from the archipelago. [...] Despite concerted opposition from both the UK and US, Mauritius has won a string of significant victories, first at the UN General Assembly, then at the UN's International Court of Justice, and finally at the UN's tribunal for settling maritime disputes. UN maps now show the territory as Mauritian, while Britain has recently been ordered by two international courts to "decolonise" Mauritius by formally renouncing its sovereignty over Chagos. [...] "This is a historic moment. It is not an unfriendly act. It is not a hostile act [against the UK]. It is what we believe is the right way to proceed in accordance with international law which has clearly stated that Mauritius is the sovereign power over the Chagos archipelago," said Jagdish Koonjul, Mauritius's UN ambassador.