the remote chagos islands, in the indian ocean, have been under british control for 50 years — but now mauritius is trying to claim them back. it has sent a boat to the islands and raised the mauritian flag. the united nations says britain must hand it back — but the uk refuses to do so while america uses one of the islands for a military base.now, some chagos islanders who've been in exile for decades have returned. our africa correspondent andrew harding was there to see their arrival. farfrom anywhere, a hidden archipelago. these isolated islands have been strictly off—limits