Diego Garcia Military Base and British Indian Ocean Territory Bill

Aphra Brandreth Excerpts

2nd reading
Tuesday 9th September 2025 Commons Chamber

[Aphra Brandreth (Chester South and Eddisbury) (Con)]

At the start of this Parliament, I could not have imagined that we would be asked to consider a Bill that is so uniquely detrimental to our national security, the British taxpayer, the British Chagossian people and the environment. Not only are we ceding sovereignty of a critical overseas territory, but we are paying a huge financial cost for the privilege of doing so. We have heard much today about the cost of this deal—a cost that the Government claim is £3.4 billion over 99 years, but in reality it is many times greater.

This deal is unique: it will leave the UK strategically weaker in one of the most contested regions of the world, which is likely to shape the future direction of geopolitics, at a time when the world is more volatile than ever, with 2024 seeing the greatest number of conflicts around the globe since the second world war.

Allow me to start with the finances of the deal. It took a freedom of information request for this Government to level with the British people that this deal would in fact cost £35 billion, with some analysis even suggesting it could be as much as £47 billion. It would have been far better for the Government to have come clean over the true cost of the Chagos deal, rather than trying accountancy tricks to pull the wool over our eyes.

I would like to put into context the sheer scale of £35 billion of taxpayers’ money: it could be used to pay for 10 Queen Elizabeth-class aircraft carriers; it is over half the annual schools budget; it is the estimated cost of the entire Hinckley Point C nuclear reactor project; it would pay for 70 hospitals, or a 5% cut on income tax—the list could go on and on. We knew this anyway, but it is worth reiterating that when the Prime Minister negotiates, Britain loses.

The hard-working people of Chester South and Eddisbury deserve a better return for the tax they pay, and they ought not to have to watch as this Government sign away British sovereign territory. Adding to that, the omission from the Bill of a money authorisation clause, removing Parliament’s ability to vote on sending billions of pounds to Mauritius, is completely wrong.

That leads me to the strategic implications of the Bill. The Diego Garcia base is one of seven permanent points of presence within the Indo-Pacific region. Owing to its position in the middle of the Indian ocean and proximity to shipping lanes, it is vital for our national security and regional influence. It is a key base from which our armed forces can protect us from hostile states and non-state actors and activity. From a security standpoint, it is deeply concerning that we are losing sovereignty over this base and the influence that we could exert from it.

According to the treaty, the UK is compelled to notify the Mauritian Government on certain aspects of military activity in and around the base. This does not make us safer. Think back to earlier this year when our American allies conducted strikes against Iran. What if the UK were to support our allies in such action? This deal would require, as we have heard, for us to expeditiously inform the Mauritian Government of our actions. I appreciate that the Minister has clarified that no advanced notification is required, although one might ask why we should have to inform Mauritius at all, expeditiously or not. Perhaps the Minister can clarify whether the provisions under annex 1, paragraph 2 also extend to special forces operations, and, if so, what guarantee there would be that highly sensitive security information would not end up in the hands of our adversaries.

China, Iran and Russia have all welcomed the deal. As the shadow Minister highlighted, the Chinese ambassador to Mauritius congratulated the Government of Mauritius and the Deputy Prime Minister in a press conference following the deal’s announcement, thanking China for its support throughout the process. China does not do geopolitical favours, so its support should cause the Government to pause and reflect. Iran has also welcomed the deal and we know that it is forging closer ties with Russia, so perhaps in his closing remarks the Minister can share with the House how Ministers have somehow come to a different conclusion and deduced instead that all three of those geopolitical threats are opposed to the deal.

But it is not just the huge financial cost or the significant security implications of the deal that are deeply concerning, but that it has ignored the voices of British Chagossians. In June this year, I met people from the Chagossian community who came to Parliament to speak with MPs. Their message was very clear: they feel let down by a lack of transparency and consultation, and are deeply uncertain about their future. It is not surprising that they feel ignored and betrayed, given that the former Foreign Secretary met them only once—once—on a deal that is so significant for them.

The Government must put that right and take the opportunity to implement a recommendation put forward by the House of Lords International Relations and Defence Committee and International Agreements Committee, outlined in the report that looked at the treaty. They urged the Government to

“Enhance Chagossian engagement by establishing a formal consultation mechanism with the Chagossian community to monitor the Agreement’s implementation and ensure their meaningful inclusion in decision-making.”

Will the Minister confirm whether that recommendation has been implemented?

The deal provides British Chagossians with no guaranteed rights of return to their homeland. I therefore ask the Minister to state clearly whether the Government have negotiated an agreement in which British Chagossians’ rights to visit the Chagos islands are left entirely in the hands of Mauritius, and whether it is feasible that they may be refused the right to return or even visit. That would be wholly unacceptable.

Further, the Chagos trust fund, established as part of the UK-Mauritius treaty and financed by the UK, is to be distributed solely under the control of Mauritius, yet the Bill contains no provisions to monitor whether the rights of British Chagossians are upheld or to create any statutory oversight of the trust fund. Have Ministers secured from the Government of Mauritius any firm commitment that British Chagossians will have a formal role in the oversight and decision making regarding the fund? Indeed, why was a model of joint governance not agreed, ensuring that British Chagossians themselves have a voice in how the fund is governed and can benefit directly from it?

Added to all this, the deal currently risks leaving a pristine marine environment unprotected. The waters around the Chagos islands are home to 220 species of coral, 855 species of fish and 355 species of molluscs. These waters have been fully protected since 2010 by the UK Government. Although it is welcome that there is a commitment to continue with a marine protected area, we do not know what levels of support Mauritius will put into the MPA. Indeed, there are real concerns that the Mauritian Government do not have the capabilities to monitor, enforce and protect these waters, with no assurance that there will be no fishing and trawling in them.

From the eye-watering costs to the grave security risks, the betrayal of British Chagossians and the environmental damage this treaty risks unleashing, this is a uniquely bad deal. It asks us to pay more, risk more and gain nothing in return. For the sake of our national interest and our duty to the Chagossian people, I cannot support this Bill.