They will however reassure the Americans that the Diego Garcia base can stay, albeit with different landlords.

Mr Ramgoolam is likely make the argument to Mr Cameron that the original decision to remove the Chagossians was unlawful.

David Snoxell, a former British high commissioner to Mauritius and secretary of the Chagos Islands all-party parliamentary group, said: "What better opportunity could there be than for the two leaders to discuss the issues face to face?

"What better way to mark the Queen's long reign, which has seen the transition of Empire to Commonwealth, than by bringing an end to this tragedy and relic of Empire in the Indian Ocean and allowing the Queen's subjects to return to their beloved islands?"

The meeting between the prime ministers comes as the Government faces multiple legal challenges over the islands.

In July the High Court in London is due to hold a judicial review on legality of the 200-mile Marine Protection Area created in 2010 in the final months of the Labour government.

Chagossians exiled on Mauritius argue that the wildlife haven was created principally to prevent islanders' returning, as it contained a ban on all types of fishing, which would be vital to returnees' survival.

In a US diplomatic cable unearthed by WikiLeaks, Foreign Office official Colin Roberts "asserted that establishing a marine park would, in effect, put paid to resettlement claims of the archipelago's former residents".

Mr Ramgoolam's government is bringing a separate case before the International Tribunal of the Law of the Sea in Hamburg that Britain did not have the right to declare the conservation area. Mauritius is being represented in the case by Philippe Sands, the leading international human rights lawyer.

Mauritius has tried to prove its trustworthiness to Britain and the US by agreeing to have a court to try pirates operating off the east African coast. It believes it is on stronger ground to make its arguments about sovereignty and the right of the islanders to resettle.

Originally posted here:

Fate of Chagos Islands to be decided