Diego Garcia Military Base and British Indian Ocean Territory Bill

Lord Morrow Excerpts

Tuesday 25th November 2025 Lords Chamber

Moved by

[Lord Morrow]

20J: Clause 1, page 1, line 7, at end insert “, subject to subsection (2A).
(2A) Sections 2 to 4 do not come into force until the Secretary of State has produced a report setting out any reasons for rejecting any remedies otherwise than this Treaty for resolving challenges to the United Kingdom’s sovereignty of the Chagos Archipelago.”

[Lord Morrow (DUP)]

My Lords, Amendment 20J in my name proposes that Clauses 2 to 4 do not come into force until the Secretary of State has produced a report setting out the reasons for rejecting the alternative legal remedies to those set out in the Mauritius treaty for resolving challenges to the United Kingdom’s sovereignty of the Chagos Archipelago.

At the heart of the Government’s justification for proceeding with the Bill to bring the Mauritius treaty into force is the non-binding judgment of the International Court of Justice from 2019. The Government have, I think, acknowledged that it is not binding but have sought to ensure that, if it is ignored, binding judgments will quickly arise and other countries upon which we depend to run the base would then refuse to help. The Government have not clearly explained what these feared judgments are and why they would be binding. I invite the Minister to do so in detail and to tell the Committee which countries we depend on to run the islands, which we think would then refuse key services and what those services are.

However, in this amendment, I want to probe a different approach. The Government tell us that this is a critical Bill because its passage will facilitate the coming into force of the Mauritius treaty. The treaty is vital because the United States has told the UK Government that it is unhappy about having a major US base on Diego Garcia when the sovereignty of Garcia is contested. Furthermore, it has paused investment on Diego Garcia, which will not recommence until the legal standing of the Chagos Islands has been resolved.

It is crucial that this matter is resolved, because the security—not just of the United States but of the United Kingdom and the West—depends on full US investment in Diego Garcia. In this context, the reason why the Bill and the treaty, which will come into force if it becomes an Act of Parliament, are vital is because they set out the only route to legal certainty for the standing of the US military base. However, this solution does not provide the only way forward to secure legal certainty, and there are alternative ways forward that would better secure legal certainty than the Bill and the treaty. It is the purpose of my amendment to ask the Government to consider these alternatives.

The problem with the Government’s approach in claiming that the treaty constitutes the only legal way forward is that it is the product of a non-binding legal judgment that was a response to the disagreement between two parties—the Republic of Mauritius and the United Kingdom. The Chagossians were not a party to the case because at that time they did not have international personality. Had they been a party then, the judgment would have dealt with a wider range of issues and considered a wider range of ways forward.

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[The Minister of State, Foreign, Commonwealth and Development Office (Baroness Chapman of Darlington) (Lab)]

In relation to Amendment 20J, the House has dedicated at least 15 hours to debating the Government’s rationale for entering this treaty. It has been subject to two reports, by the International Agreements Committee and the International Relations and Defence Committee. Three separate committees—the IAC, the IRDC and the Foreign Affairs Committee—have held evidence sessions and questioned the Minister for the Overseas Territories.

The Government have been consistently clear throughout. The legal case was compelling and there was no credible alternative. A policy of hanging tough, which I assume the noble Lord has in mind, would have been a real gift to our adversaries. As we have stated on numerous occasions, the continued operation of the base was under threat. Courts were already making decisions which undermined our position. If a long-term deal had not been reached, further wide-ranging litigation was likely, with no realistic prospect of the UK successfully defending its legal position on sovereignty in such cases.

Legally binding provisional measures from the courts could have come within weeks, affecting, for example, our ability to patrol the waters around Diego Garcia. Both the IRDC and the IAC recognise that the treaty provides legal certainty for the base. I hope the noble Lord will withdraw his amendment.

[Lord Morrow (DUP)]

My Lords, I thank all those who have spoken in this debate. I have noticed that no one has spoken against the amendment, other than the Minister who brought her explanation and reason. I beg leave to withdraw my amendment.

Amendment 20J withdrawn.

Moved by

[Lord Morrow]

20K: Clause 1, page 1, line 7, at end insert “, subject to subsection (2A).
(2A) Sections 2 to 4 do not come into force until the Secretary of State has produced a report assessing the ability of the Government of Mauritius to govern the Chagos Archipelago under the terms of the Treaty and the implications for international peace and stability of transferring sovereignty.”

[Lord Morrow (DUP)]

My Lords, there has been lot of talk about the rules-based international order in recent years, largely in response to the concern that the reality to which it testifies looks considerably less certain in the context of the development of what some scholars are now calling Cold War II. The truth, however, is that international relations has never been a strictly rule-based order, in the sense that it has approximated life in the domestic context. On the other hand, informed by social conventions that testify to the common humanity of all the people of the earth, international relations has never approximated to international anarchy. There have always been rules, and yet they have been different from the domestic sense because of the absence of a world state with all the sanctions of domestic government.

In this context, those rules have to accommodate considerations of power in a way that we do not see domestically. Sound thinking about international relations has never been just about rules abstracted from considerations of power any more than it has been about power abstracted from rules.

We can get into real difficulty if we lose sight of questions of power. One critical way in which international relations has conventionally had regard for questions of power arises from the point at which a new sovereign state, whether arising from the break-up of an existing state, decolonisation, or some other kind of reconfiguration of territorial integrity, is recognised by other sovereign states. This act of recognition conveys on the state sovereignty as the international personality. It involves those states saying that they recognise the right of the other state to exist, with its territorial integrity, and the right of that state to make the laws to which it is subject in relation to that territorial integrity.

This process is mutual in the sense that if state A will not recognise state B, then state B usually will not recognise state A until state A recognises it. One of the critical questions facing a sovereign state in determining whether it recognises another state is whether it recognises its full territorial integrity and right to make the laws of that territorial integrity, together with an assessment of its physical capacity to govern that territorial integrity.

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[Baroness Chapman of Darlington (Lab)]

I suggest that the noble Lord looks at the ways in which marine protected areas are generally enforced. It is not, as he seems to imagine, by patrolling in vessels around the ocean, checking on things. That is not how these things work. But I will gladly send him some information about that.

[Lord Morrow (DUP)]

My Lords, I thank the noble Baroness, Lady Hoey, and the noble Lord, Lord Callanan, for their contributions. Having listened to the Minister, I am wondering whether she will get time to reflect on this debate and on what has been asked and what has been said. Perhaps, if she does, she will write to us and put her reply in the Library, for the availability of every Peer in this House. I beg leave to withdraw my amendment.

Amendment 20K withdrawn.

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[Baroness Hoey (Non-Afl)]

My Lords, my Amendment 50B is very clear and simple, and nothing to do with security on Diego Garcia or the details of the treaty between Mauritius and the United Kingdom. It is simple: it is for our Government to recognise the Chagossian people in the law of the United Kingdom as an indigenous people of the Chagos Archipelago.

I raise this because so many of the Chagossians we have met and know are men and women who have lived on these islands, who were baptised in the island chapels, who fished, who tended their gardens, who raised children and buried their dead there. They are the indigenous people of the Chagos Archipelago. It is important that what they have asked for, that they are recognised by our country, is agreed to.

The need for this amendment arises because even now, more than half a century after their removal, the Chagossian people are still being told by Ministers that they never existed as a permanent population, that their islands were never self-governing in any meaningful sense and that there is therefore no question of self-determination. Only last week, on the first day in Committee, the Minister, the noble Baroness, Lady Chapman, repeated that claim, saying:

“The Chagos Archipelago has no permanent population nor has ever been self-governing. No question of self-determination for its population can therefore arise”.—[Official Report, 18/11/25; col. 795.]


That statement is not true. It is contradicted by every serious historical study, by the records in the National Archives, by the findings of the International Court of Justice, by the judgment of our own courts and most importantly by the lived memory of the men and women who have written to and met us and live all over in the diaspora.

The noble Lord, Lord Hannan, said that he would not go into the history, but it is important when we are discussing a people that we understand the history. Archival records from the 19th and 20th centuries list births, marriages and burials across multiple generations on Peros Banhos, Salomon and Diego Garcia. Parish registers from Notre Dame de L’Assomption on Diego Garcia record entire family lines. Children were born there, married there and died there. The High Court in the Bancoult judgments accepted that the Chagossians were a settled people. The International Court of Justice—one of the reasons we have this treaty—in its 2019 advisory opinion recognised the Chagossians as the people of the territory with a right to self-determination. Research and documents from various academics have shown that there is at least 150 to 170 years of continuous multigenerational residence.

That is what an indigenous people is; that is what a permanent population is. Yet the Government continue to repeat a narrative first invented back in 1968, when the Foreign Office issued internal instructions to describe the Chagossians in public as temporary contract workers to avoid United Nations scrutiny. Those instructions are still in the archives and still legible. They show unequivocally that the United Kingdom knew the truth then, and it should know the truth now. It is time for this Parliament in discussing this treaty to put the truth into law.

The Minister also claimed that the islands were never self-governing but, as every historian of the archipelago now agrees, the islands were in practice run not by resident British administrators, who were almost never present, but by the Chagossians themselves. Families organised communal work, maintained chapels and community buildings and settled disputes. Testimony from multiple surviving islanders shows that respected elders served as local leaders.

One of the older Chagossian families that has been mentioned before in Committee, the Mandarin family of Peros Banhos, has given oral testimony that their ancestor, Jean Charles Mandarin, a blacksmith serving the whole island, was nominated by the community to act as a local headman in the long absence of any resident British authority. His leadership was even recorded in a scholarly Brill volume on the dispossession of the Chagos Islands, describing him as “a thorn in the flesh of the administration”. His grandson, Fernand Mandarin, born on Peros Banhos, later led the Chagossian Social Committee, represented his people at the United Nations and wrote one of the most detailed oral histories of island life. Today, his descendants continue that leadership in ongoing legal actions before the High Court. How can the Minister stand in this Chamber and say there was no permanent population and no self-organisation when the evidence is so overwhelmingly clear?

The amendment puts this right. It recognises in law what the world’s historians, courts and international institutions have already recognised: that the Chagossians are the indigenous people of the Chagos Islands. The amendment clearly defines them as those born on the islands

“prior to their depopulation between 1968 and 1973”

and their direct descendants. It requires the Secretary of State, when exercising any function under the Bill, to have regard to their identity, cultural integrity and rights.

The amendment is necessary, because the Bill does exactly the opposite with Clauses 2 to 4, which would abolish the British Indian Ocean Territory for every island except Diego Garcia, stripping away the only remaining statutory recognition of the Chagossian people’s historic and legal connection to their homeland. It would remove the very provisions in the British Nationality Act through which they are currently recognised in law. It would hand their homeland to another state without any act of self-determination, despite the clear findings of the International Court of Justice that the Chagossian people are entitled to that right.

We now know what that means in practice. Mauritian authorities have already begun issuing new birth certificates to Chagossians, in which the place of birth is rewritten as Mauritius, erasing all mention of the islands. That is actually happening. I have seen some of that documentary proof.

The recognition in the amendment would prevent that erasure. It does not settle the question of sovereignty, prejudge the right of return or determine citizenship policy, but it ensures that the people who lived on these islands for generations, who were removed without consent and who have been fighting to preserve their identity ever since cannot be written out of their own history or out of our legislation.

One native islander wrote:

“We want our name to exist before we die. We want to be seen as the people of our islands, not as shadows erased from paper.”


Another wrote:

“They took our homes. They took our animals. They took our graves. Please, do not let them take our identity in law.”


Another important one says:

“The Minister says we were never a people. I lived my whole childhood on Peros Banhos. My father and mother were born there. How can she say we were not there?”


The world knows that there was a people in the Chagos Islands. The archives know, the courts know, the UN knows, the historians know and the survivors who still bear witness know. Only this Bill seems to pretend otherwise. I believe that recognition is the minimum moral duty owed to a people who were removed from their homeland, denied their rights and then told that their existence did not matter.

The amendment affirms that they did exist, they do exist and they will continue to exist in the law of this country. I know that a group of Chagossians have written to the Minister in the last few days questioning why she made such a statement. I hope that she will be able to give them some support tonight and say that she recognises their existence and that they should be recognised in the law of the United Kingdom. The amendment does not affect anything to do with security, which seems to be and rightly, perhaps, is the real reason for what the Government are doing. This does not affect one single bit of anything to do with the security of the Chagos Islands, so I hope that the Minister will go back and accept the amendment on Report.

[Lord Morrow (DUP)]

My Lords, Amendment 81 in my name is in some key senses the most important of all the amendments that I have tabled in Committee. The purpose of Amendment 81 is to probe the question of what will happen to the Chagossian people if the Bill receives Royal Assent and the Mauritius treaty comes into force. The logic that underpins the Government’s position is that Chagossians are, from the civic perspective—the perspective of their citizenship—Mauritian.

Of course, this will not change their ethnicity, but it will extinguish a critical dimension of their identity, which, while in a very real sense it was suspended as a result of the gross injustices that were committed against them in 1968 and 1973, has not been extinguished. Although the splitting of the Chagos Islands from Mauritius in 1965 was imposed on the Chagossians, it bestowed on them a civic identity apart from Mauritius that they were pleased to receive and enjoyed while living on their islands from 1965 until their forced expulsion.