UK Shelves Chagos Islands Legislation After US Drops Support
Summary
The UK government has been forced to shelve legislation that would have transferred sovereignty of the Chagos Islands to Mauritius after the US withdrew its support for the agreement. UK officials acknowledged that time had run out to pass the legislation within the current parliamentary session, which ends in the coming weeks. The agreement would have seen the UK cede sovereignty while leasing Diego Garcia, the largest island, for 99 years to continue operating the joint US-UK military base.
What changed
The UK government's plan to transfer sovereignty of the Chagos Islands to Mauritius has been shelved after the US dropped its support for the agreement. The proposed legislation would have formalised the ceding of sovereignty to Mauritius while allowing the UK and US to lease Diego Garcia for 99 years to maintain the joint military base. US officials had not formally exchanged letters to amend the 1966 British-American treaty, effectively blocking the legislation.
For Chagossian communities and stakeholders following the territorial dispute, the shelving represents a significant setback. The government has stated that the agreement required US support to proceed, and without it, the legislation cannot advance in the current parliamentary session. The Diego Garcia military base remains operational under existing arrangements.
What to do next
- Monitor for updates on future legislative efforts
Archived snapshot
Apr 14, 2026GovPing captured this document from the original source. If the source has since changed or been removed, this is the text as it existed at that time.
Britain had planned to cede sovereignty to Mauritius, and lease the largest island of the achipelago, Diego Garcia, for 99 years to continue operating the joint military base there. Photograph: CPA Media Pte Ltd/PA
Britain had planned to cede sovereignty to Mauritius, and lease the largest island of the achipelago, Diego Garcia, for 99 years to continue operating the joint military base there. Photograph: CPA Media Pte Ltd/PA
UK forced to shelve Chagos Islands legislation after US dropped support
Officials accept that time has run out to pass law to allow transfer of islands to Mauritius
Sat 11 Apr 2026 11.43 EDT
First published on Sat 11 Apr 2026 04.18 EDT
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The UK government has been forced to shelve its legislation to hand the Chagos Islands to Mauritius, after the US dropped its support for the agreement.
On Friday, UK government officials acknowledged that they had run out of time to pass legislation within the current parliamentary session, which ends in the coming weeks.
The latest setback in the UK’s push to hand the Chagos Islands to Mauritius, which hosts a joint US-UK Diego Garcia military base, is a sign of the worsening US-UK relations after Donald Trump’s heavy criticism of Keir Starmer over his handling of the Iran war.
A government spokesperson said: “Diego Garcia is a key strategic military asset for both the UK and the US. Ensuring its long-term operational security is, and will continue to be, our priority – it is the entire reason for the deal.
“We continue to believe the agreement is the best way to protect the long-term future of the base, but we have always said we would only proceed with the deal if it has US support.”
Chagossian protesters gather outside the Royal Courts of Justice in October 2025 during a judicial review challenging the UK government decision to hand over Chagos Islands to Mauritius. Photograph: Vuk Valcic/Zuma Press Wire/Shutterstock
The US president has previously criticised the plan, which is backed by the US state department, telling Starmer he was “making a big mistake” by handing sovereignty of the islands to Mauritius in exchange for the UK and US being allowed to continue using their airbase.
However, earlier in February Trump had described it as the “best” deal the prime minister could make in the circumstances. The US president also endorsed the handover when Starmer visited the White House last year.
Under the deal, the UK would cede sovereignty of the Chagos Islands to Mauritius, and lease the largest island of the archipelago, Diego Garcia, for 99 years to continue operating the joint military base there.
The US had not formally exchanged letters to amend a 1966 British-American treaty on the islands that is understood to have forced the UK to drop its bill.
Now, a new Chagos bill is not expected to feature in the king’s speech in May, where the government’s agenda for the coming parliament is revealed.
Kemi Badenoch, the Conservative leader, said on X that the time the Labour government took to drop the bill is “another damning indictment of a prime minister, who fought to hand over British sovereign territory and pay £35bn to use a crucial military base which was already ours”.
Simon McDonald, a former permanent secretary at the Foreign Office, told BBC Radio 4’s Today programme that the government had “no other choice” than to halt the deal for the time being.
“The UK had two objectives, one was to comply with international law, the second was to reinforce the relationship with the United States,” he said. “When the president of the United States is openly hostile, the government has to rethink, so this agreement, this treaty will go into the deep freeze for the time being.”
The Chagos Islands are officially known as British Indian Ocean Terrority and have been controlled by the UK since the 19th century. In 2019, the international court of justice found that the UK unlawfully separated the islands from Mauritius before it granted independence to the country in 1968. Thousands of islanders were then forcibly deported to make way for the US-UK military base.
However, many Chagossians and their descendants would prefer the UK to retain sovereignty over the islands, in the hope they can one day return.
Another protest takes place outside the high court in May 2025. Photograph: Yui Mok/PA
The Reform UK leader, Nigel Farage, said: “This is great news and long overdue. Now the government must right a terrible wrong and help the Chagossians to fully resettle their home.”
The Liberal Democrat foreign affairs spokesperson, Calum Miller, said the handling of the Chagos deal had been “shambolic”. Miller said: “Any deal must provide clarity on the future military partnership with the US and address Chagossian rights and parliamentary scrutiny of the sums involved.”
In February, the Guardian reported Trump changed his mind on supporting the deal because the UK would not permit its airbases to be used for a pre-emptive US strike on Iran.
Last month, Iran launched two missiles at the joint military base after warning British lives were in danger because Starmer authorised the US to carry out further strikes from British bases.
At the time, Hamish Falconer, a Foreign Office minister and former diplomat, had told MPs that discussions with American counterparts were paused and that the process through parliament in relation to the treaty would be brought back at an appropriate time.
Starmer has allowed US forces to use UK bases, such as Diego Garcia, only for defensive missions against Iran. This month, he faced increased pressure to limit access after Trump threatened “a whole civilisation” would die if Iran ignored his demands, before a ceasefire was later agreed.
In an effort to contain the confusion surrounding Falconer’s comments, the Foreign Office said there was no pause or set deadline, and timings would be announced “in the usual way”.
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