British Indian Ocean Territory

Monday 7th October 2024 Written Statements

[The Secretary of State for Foreign, Commonwealth and Development Affairs (Mr David Lammy)]

On 3 October the United Kingdom and the Republic of Mauritius reached an historic agreement on the exercise of sovereignty over the British Indian Ocean Territory/Chagos archipelago. The agreement secures the strategically important UK-US military base on Diego Garcia.

The base on Diego Garcia is critical to national and international security. It has enabled the UK, the US, and our allies and partners to combat some of the most challenging threats to global peace and security, including those from terrorism, organised crime, and instability.

However, since its creation, the British Indian Ocean Territory and the joint UK-US military base on Diego Garcia has had a contested existence. It has been challenged through various international courts and tribunals, threatening the long-term, secure operation of the base. In recent years, this threat had risen significantly. A legally binding decision against the UK seemed inevitable. It was only a matter of time before the UK would have had to choose between breaking international law or negotiating from a position of weakness and risking national security. The situation was also impacting our relationship with the US, which did not want the legal uncertainty and strongly encouraged us to strike a deal.

In recognition of this, two years ago, the previous Government began sovereignty negotiations. Despite 11 rounds of negotiations, substantive and difficult issues remained.

This Government inherited unfinished business. We were not prepared to put the security interests of this country or our partners at risk. We therefore prioritised an agreement that fundamentally protected UK national interests, respected the interests of our partners, and upheld the international rule of law. The resulting agreement fulfils these objectives.

It is strongly supported by our partners, including the United States. President Biden issued a statement “applauding” this historic agreement within minutes of its announcement. Secretary Blinken and Defence Secretary Austin have also voiced clear public support. India and the African Union have also hailed the agreement. The agreement strengthens our arguments when it comes to issues like Ukraine or the South China sea.

Under the terms of the agreement, the United Kingdom will agree that the Republic of Mauritius has sovereignty over the British Indian Ocean Territory, also known as the Chagos archipelago. In return, Mauritius will authorise us to exercise their sovereign rights needed for the long-term, secure and effective operation of the joint military base. The agreement covers an initial period of 99 years, with the UK having the right to extend.

For the first time in over 50 years, the base will be undisputed and legally secure, able to operate to its full strategic capability without risk of challenge. The agreement will mean that the UK and US will continue to operate the base well into the next century.

We have full Mauritian backing for robust security arrangements, including preventing foreign armed forces from accessing or establishing themselves on the outer islands. The base’s long-term future is more secure under this agreement than without it.

The agreement also addresses the wrongs of the past. This Government deeply regret the way Chagossians were removed from the islands, and the way they were treated thereafter. Chagossian interests were at the heart of the agreement. For the first time since the establishment of the base, the Republic of Mauritius will be able to implement a programme of resettlement to the islands other than Diego Garcia. The UK and the Republic of Mauritius have also committed to support the welfare of Chagossians. The UK will finance a new trust fund for the Republic of Mauritius to use in support of the Chagossian community and remains committed to supporting Chagossians in the UK.

Recognising that relations with our overseas territories are of great interest to this House, Members can be assured that this is a unique agreement that has absolutely no bearing on wider UK Government policy regarding our other overseas territories. Our sovereignty of the Cyprus sovereign base areas, Gibraltar, the Falklands or any OT is not up for negotiation. Each overseas territory has a very different history and they cannot be compared. The UK remains committed to our overseas territories family.

This agreement will be underpinned by a financial package which will be proportionate to the importance of ensuring international security.

This agreement ushers in a new era in relations between the UK and the Republic of Mauritius, two close partners with deep and enduring ties. We intend to intensify co-operation on a wide range of shared priorities, including security, the environment, and economic growth. This will include co-operation to protect the archipelago’s unique environment.

The agreement is subject to the finalisation of a treaty which the Government intend to complete over the coming months. Further details will remain confidential until the final version of the treaty has been signed by both sides. Following signature, the Government intend to bring forward a Bill to make the necessary amendments to current legislation to implement the agreement. Parliament will also have the opportunity to scrutinise the treaty in the usual way under the Constitutional Reform and Governance Act 2010 (CraG). Both processes are required to take place before ratification.

[HCWS109]