PARLIAMENTARY DEBATE
Diego Garcia Military Base and British Indian Ocean Territory Bill - 13 April 2026 (Commons/Commons Chamber)
Debate Detail
We have debated at length the critical importance of the military base on Diego Garcia to the national security of the United Kingdom and that of our allies. The base allows us to project the full array of military capabilities in one of the most important regions for international stability and global trade. It is vital to the countering of terrorism and threats from state adversaries, and protects Britons at home and overseas.
As the House knows, the operation of the base has been under threat for decades. The Government inherited a situation in which there was no legal certainty for future operations, and the threat of the UK losing our ability to operate effectively for us and our allies was and remains real, as those on the Opposition Benches know full well. The status quo is untenable, and ignoring the situation would have been reckless and irresponsible. The previous Government knew that, which is why they opened negotiations with Mauritius, why they put sovereignty on the table, and why they had 11 rounds of talks and agreed the vast majority of the treaty. [Interruption.] I know the Conservatives do not want to hear this, but it would be better if we had some quiet and I could make the statement.
I am proud that this Government completed the process in May last year. The Diego Garcia treaty puts the base on a secure legal footing for the first time in decades. It gives us complete operational freedom, and puts in place important safeguards to protect the base from outside threats. In short, the treaty ensures the continued contribution of the base to UK national security, and to the security of our allies, for generations.
The Diego Garcia military base was founded as a jointly operated base by the UK and the United States. It is one of the foundation stones on which our close defence and security partnership was built. Of course, the previous Government knew that, which is why they took action to start the negotiations when they did. For that reason, the treaty to protect the base was negotiated in close co-ordination with the United States, under both this and the previous US Administration. The treaty was tested thoroughly at all levels of the United States system under two Administrations, and found to be robust.
Throughout this process, we have always been clear that we could not let the treaty enter into force without US support. We had that support when the treaty was signed, and we have had it consistently since. President Trump called it “very strong” and “powerful”. Secretary Rubio welcomed it as a “historic agreement” that
“secures the long-term, stable, and effective operation of the joint US-UK military facility at Diego Garcia”.
Nothing in the treaty has changed since then, and the United States’ support has been consistent in viewing the agreement as the best means of protecting operations on this vital military asset.
However, the position of the US President appears to have changed in recent weeks. This means that, in practical terms, it has become impossible to agree at political level an update to the 1966 UK-US agreement concerning the availability of defence purposes of the British Indian Ocean Territory, known as the exchange of notes, which is necessary to ratify the treaty. Right hon. and hon. Members will know that updates to the exchange of notes are nothing unusual; in fact, they have been updated periodically to ensure that the governance arrangements for the base remain fit for purpose in a changing world. They were updated in 1972, 1976, 1987 and 1999, and were rolled over in 2016. They now need a further update in the light of the Diego Garcia treaty. We have previously debated this issue in this House, and I know that my counterpart, Baroness Chapman, has similarly discussed it in the other place.
Officials from the Foreign, Commonwealth and Development Office and from the Ministry of Defence, have been working with United States counterparts over many months and have made excellent progress in updating the agreement. I can confirm that a finalised text was agreed at official level and is ready for political clearance and signature, but due to the new comments to which I referred, this process will obviously not proceed on the previously agreed timeframe. Because of the delays in agreeing the exchange of notes, the Diego Garcia Bill cannot complete its passage in this parliamentary Session, and it cannot be carried over due to its advanced progression through Parliament. The Government nevertheless remain confident that the Diego Garcia treaty is the best means of protecting the full operation of the military base for us and our allies for future generations. We will continue to work with the United States on the agreement and the way forward, and we will continue to engage closely with Mauritius.
In parallel with the geostrategic developments, there is the human story. I refer to the Chagossians, who have rightly been raised by many right hon. and hon. Members, and who were removed from the archipelago in the 1960s and ’70s. As I have said on many occasions, the Government deeply regret the manner of their removal, and we remain committed to building a relationship with Chagossian communities that is built on respect and an acknowledgment of the wrongs of the past. The delay to the treaty will be sad news to many Chagossians—although I accept not all—who rightly see it as the only viable means of a sustainable programme of resettlement, which Mauritius would be able to implement under its terms. As I have said on many occasions, we also want to see the recommencement of the programme of heritage visits, which we understand are so important to Chagossians, particularly to the older generations.
These are times of great uncertainty and acute risk to British interests. Our security and prosperity are under threat at home and overseas, and this is a moment for calm and considered reflection, not cheap political point scoring by Opposition parties—[Interruption.] They are absolutely proving this very point. They would put our security at risk and play reckless games.
The threats facing the future operation of the Diego Garcia base are real, as the Opposition well know, and the Diego Garcia treaty remains the best means of securing the vital military base on the island. We will continue to work with partners, including the United States and Mauritius, to protect our national security and that of our allies. I commend this statement to the House.
Let us be clear: the surrender treaty is Labour’s mess. As the House knows, within days of coming to office, the Prime Minister’s top foreign policy priority was to exceed the wishes of his left-wing lawyer friends and surrender the Chagos islands, at an enormous cost to British taxpayers. He met the Mauritian Prime Minister, appointed Jonathan Powell to conclude the negotiations, and rushed and blundered into the treaty. The Government inexplicably announced it to the world just before Mauritius went into an election. When the Mauritian Government with whom they agreed the deal got kicked out, the new Mauritian Government—guess what?—demanded more concessions from Britain, and Labour rolled over and got eaten for breakfast. The Government put one of our most important defence and security assets at risk. They compromised the special relationship with the United States, they ignored and betrayed the wishes of the Chagossian community, and they were prepared to hand over £35 billion of taxpayers’ money to lease back a land that we own. Then they went ahead with the deal before receiving the critical exchange of notes from the United States.
Having been to the United States recently, I am not in the least surprised that the Administration have sought to stop the deal, because they can see what we have been saying for a long time. It is the Conservatives who have opposed this Labour deal at every turn. While Labour has spectacularly failed to defend British sovereignty and Reform has gone from suggesting that we sell the Chagos islands to the US to suggesting that we give them to the Maldives, the Conservative party has been effectively scrutinising and opposing this surrender at every step of the way, to make sure that we keep Chagos British and that we protect our sovereignty and our taxpayers.
It is the Conservatives who have exposed the full £35 billion cost of the deal. It is the Conservatives who have dismantled Labour’s outrageous and offensive narrative that those who oppose the Chagos surrender are siding with Britain’s adversaries. It is the Conservatives who have brought to the fore the major security concerns about this deal and exposed the fact that Mauritius is deepening its partnerships with Russia, China and Iran. It is the Conservatives who have been pressing the Government for months on their totally inadequate answers about why the anti-nuclear Pelindaba treaty would apply to Diego Garcia. And it is the Conservatives who have supported the Chagossians at every step of the way, given them a voice and spoken up for them.
Our questions and debates in this House and the other place have held Labour to account and forced the Government into the position set out today. Although the surrender and the whole process have now been ripped up, I want to ask the Minister some fundamental questions. The Mauritian Government have announced that a UK delegation is going to Mauritius later this month. Will the Minister tell us who is going, and what is the purpose? What will they be negotiating? Is there a new timetable? What is actually going to happen?
We also know that Mauritius has budgeted to receive the surrender payments from the British Government, so can the Minister confirm that no payments will be made to Mauritius as a result of what he has announced today? Will the Labour Government commit to spending the money that they were planning to ship to Mauritius on boosting defence spending at this critical time, which is exactly what the British taxpayer wants? It should now be clearly allocated for the purpose of this fundamental resource.
Can the Minister confirm in no uncertain terms that as long as the US opposes this deal, Labour will not seek in any way to reinstate it? On the Chagossians, if the islands stay British, is it the Government’s intention to look at resettlement options? Will the Minister rule out any new legislation in the next Session, even if it is not in the King’s Speech, so that the surrender treaty cannot become operable? The only Bill that the Government should take forward in the next Session is my original Bill to make sure that Chagos remains British.
Of course, it is not for the Government simply to choose easy paths. It is for the Government to choose the right path: the path that is in the interests of Britain and our national security, and that of our allies. At the heart of this is a fundamental question. The Opposition know that there is a huge challenge. They knew that there was a problem, which is why they started the process. Throughout all the exchanges we have had, they have never been able to answer that simple question.
I cannot recall a time when we have seen so much misinformation and, quite frankly, negligent disregard for the national interests and security of the British people. It is regrettable that the official Opposition and indeed the Reform party—I see that only one of its Members has turned up today—have been at the heart of this. Of course, they will say that this is just politics and that the Government should be thick-skinned, but quite frankly the British public deserve better.
The national interest is what drives this Government and our national security, as the Conservatives well knew, which is why they started the process. We have seen frankly ludicrous disinformation about the operations of the base, about the genuine threats that it faced, and about the security provisions in the treaty, which of course we strengthened. We also seen it about the costs: no matter how often they give false figures, that does not make them any more accurate. We have also seen it about the views of Chagossians—I accept that they are wide and varied but, conveniently, the Opposition always ignore the views of the significant numbers of Chagossian communities and groups who feel very differently about the treaty and have supported it since the start. Indeed, we have seen it about the protection of the environment.
The Opposition operate in a state of convenient amnesia, but they know the reality, they knew the jeopardy facing the base and they know that they presided over 11 rounds of negotiations. They published it in ministerial statements and in records of meetings with the Mauritian Prime Minister. They know, too, that the treaty signed by this Government was born of their policy choices and their negotiation mandates. As ever, the Opposition cannot run away fast enough from their record in government when it suits their tiresome politicking. The British people are not fooled. They can see the hypocrisy, and they deserve better.
I am actually quite concerned, because it seems to me that the status quo is not in our national interest. What does being without a treaty mean for the long-term access to the base, for us and for our allies?
The process for negotiating this treaty has been, I am sorry to say, utterly shambolic, from its beginning under the previous Government to its demise under this one. [Interruption.] From a sedentary position, an hon. and gallant Gentleman says, “Why did we finish it?” I am sorry to tell him that they did not. There is no evidence at all that this statement was finished by the previous Government.
As this Government shelve the legislation, they must now reckon with the litany of failures that have plagued the process, specifically their inability to secure fundamental legal guarantees from the US through the necessary exchange of letters; their reluctance to adopt measures that would enable genuine parliamentary scrutiny over the planned vast sums of money that would be sent to the Government of Mauritius; and their wilful reluctance to work with or to secure the rights of Chagossians, including but not limited to the right of return to the Chagos islands.
Aside from the Government’s apparent ignorance of the legal prerequisites for the passage of the treaty, the most objectionable aspect of the process has been the woeful engagement with the Chagossian community. The British state has long denied Chagossians a meaningful say in their own future. The provisions of this treaty, shamefully, failed again to affirm those rights, so if the treaty ever does return to this House, the Government would do well to observe and understand the amendments tabled by the Liberal Democrats in the other place to secure genuine rights for Chagossians and help to buck the historical trend of that community being left out of decisions about its own future.
I have one very simple question for the Minister. Given that the Government have now abandoned their proposed deal with Mauritius over the Chagos islands, can the Foreign Secretary set out what this means in practice for the long-promised right of return for Chagossians? Will the Government now commit to supporting resettlement under continued UK sovereignty? If so, how does the Minister assess the implications of that return for the evidential and legal basis underpinning the 2019 International Court of Justice advisory opinion?
In conclusion, British citizens physically located on the islands would constitute a resident population who would be—
“Before the UK can ratify the treaty, we will need to do the following: pass both primary and secondary legislation, update the UK-US exchange of notes, and put in place agreements on the environment, maritime security and migration.”—[Official Report, House of Lords, 18 November 2025; Vol. 850, c. 713.]
We have always been clear about the processes that need to be followed in parallel. It is regrettable that there has been a delay and that we have run out of time in this parliamentary Session, but the facts have not changed as to the need for the treaty or the need for the processes and legal provisions to be put in place.
The hon. Gentleman rightly raises concerns about the Chagossians. He and I have discussed those concerns on a number of occasions. We have engaged extensively with the Chagossian communities. There are a range of views in the community; there will be many Chagossians who will be deeply disappointed by the delay with the treaty, not least for the very reason to which he refers, which is that we believe that this is the best route, under Mauritius’s guidance, leading to resettlement. I re-emphasise our commitment to restarting, at an appropriate time, the heritage visits, which are so important. The hon. Gentleman will understand why the current situation does not allow that, but we will seek to do so at the earliest opportunity. We know how important it is, particularly for heritage reasons.
Coming back to the Chagossians, why can the Government not just honour what the Court has decided about the right of return? Why are they now trying to frustrate the survival and safety of the Chagossians who have returned, taken there by my good friend and former Conservative MP Adam Holloway, who has organised the expedition despite the Government? Why are the Government now mounting operations and sending police officers and customs operators to frustrate the process of safety equipment going to the expedition to support the Chagossians? Why have they blocked a water purifier and even medical supplies? They have blocked a fast boat that would provide emergency evacuation, so these people are more at risk as a result of the Government. Is that the Government’s policy, after all the wrongs that have been done to the Chagossians?
On the wider questions about the Chagossians, I have been clear throughout that there are a range of views within the communities, including the British Chagossian communities. I have met them and heard those views, including difficult views from people who do not agree with us on this issue; I am not afraid to do that, and neither are the Government. It would not be practical to take just one person as representing a whole community. We have sought to ensure that the voices of Chagossians are heard throughout this process, such as in the proposed trust fund, by securing places on the board. As I have set out on a number of occasions, we will continue to engage with all Chagossian communities.
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