Questions over the government's commitment to maintaining the British overseas territories as part of the UK have been raised after the government announced on Thursday it was handing the Chagos Islands over to Mauritius.

Sir Keir Starmer's official spokesman said the government was ruling out negotiations over Gibraltar, claimed by Spain, and the Falkland Islands, claimed by Argentina.

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"There is no question about British sovereignty of those two, it is not up for negotiation," he said.

Following Thursday's announcement on the Chagos Islands in the Indian Ocean, Argentina's foreign minister promised "concrete action" to ensure the Falklands were handed to Buenos Aires.

However, Sir Keir's spokesman said: "The Falklands is not up for discussion - that remains our position.

"Chagos is a unique situation with a unique history, it has no bearing on other territories."

Gibraltar's chief minister Fabian Picardo said the UK's decision on the Chagos Islands has "no possible read across" to Gibraltar as the situations "are completely different".

Falkland Islands governor Alison Blake said the UK government's commitment to the islanders' UK sovereignty was "unwavering" and "remains undiminished".

Sir Keir's spokesman said the former Conservative government had carried out 11 rounds of negotiations over the Chagos Islands since 2022 and the government had picked them up and reached an agreement.

The archipelago between Mauritius and India had been at the centre of a 50-year dispute after Mauritius gained independence from the UK in 1968 but the Chagos Islands did not.

Mauritius has been trying to claim the Chagos Islands since then but the UK has resisted as it has a key naval support base with the US on the largest island, Diego Garcia.

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The native Chagossians were expelled from the islands for the base to be built, with most going to Mauritius or the Seychelles, and about 3,500 coming to the UK since 2002.

Under the new deal, the military base will remain under UK and US jurisdiction for at least the next 99 years.

Senior Conservatives criticised the decision as they fear it could grant China a foothold in the Indian Ocean as Beijing is heavily invested in Mauritius.

But Sir Keir's spokesman said the deal settles the legal challenges, contested sovereignty and international court tribunals.

A protest was taking place outside parliament today by Chagossians who are angry they were not included in the talks for their homeland's sovereignty.