Diego Garcia Military Base and British Indian Ocean Territory Bill

Tanmanjeet Singh Dhesi Excerpts

2nd reading
Tuesday 9th September 2025 Commons Chamber

[Mr Tanmanjeet Singh Dhesi (Slough) (Lab)]

I rise to speak on the Bill and proposed agreement, with particular focus on its defence implications. Given substantial other ongoing work and the fact that other Committees have looked into it, this is not an issue that our Defence Committee has investigated thus far. Let us not be under any illusion, however: this is a matter of strategic importance, financial prudence and moral responsibility.

The British Indian Ocean Territory and in particular the Diego Garcia military base have long served as a cornerstone of our defence and security capabilities, not just for the UK but for our allies in the US and across the Five Eyes community. That is why having their stated support for this deal, in addition to that of India and others, is so vital. The base’s role in disrupting threats to the UK, supporting counter-terror operations against ISIS and protecting us against hostile states must continue. Including the management of the electromagnetic spectrum satellite used for communications and the prevention of other powers operating on the outer islands without permission is vital for countering hostile interference. It is not just a diplomatic formality; it is a strategic firewall against encroachment by hostile states.

Maintaining US and UK autonomy on the base cannot be overstated. I note the Government position is that Mauritius will be expeditiously informed of activities. However, I look for reassurance that we do not need to provide Mauritius with advance warning about our operations. I would therefore welcome clarification on that point from the Minister to guarantee that all current and future operations can continue unimpeded.

[Dr Evans]

Given the importance of the Chagos islands to our defence, has the hon. Gentleman’s Committee thought about even doing a review into the Chagos islands and what this would look like? That way, such questions could be addressed directly in a decent period of time—we only have four or five hours tonight—and he could spend several weeks looking into the matter. Is that something he and his Committee would consider?

[Mr Dhesi]

As I mentioned in my introductory remarks, given that various other Committees have been looking into this and that it has been extensively debated on the Floor of the House, and considering the other work that the Committee is undertaking, including an inquiry launched this week into the Afghan data breach, that is why we have not looked into this matter. However, I will give way to the Minister, who I hope will give me some sort of reassurance.

[Luke Pollard]

To reassure my hon. Friend, as I did the hon. Member for North Dorset (Simon Hoare) earlier, we are not required to give pre-notification of any military activities to Mauritius. That is important, because some people are erroneously suggesting that we are. That is not correct; we do not have to give pre-notification.

--- Later in debate ---

[Mr Dhesi]

I thank the Minister for intervening and for that clarification. When I read the words “expeditiously inform”, I was left in a somewhat uncertain state as to what that actually meant. There must be no fettering of our ability to operate from the base.

[Richard Tice]

We have heard today that this deal—this supposed investment that is actually a liability—is essential to the defence of our realm. Yet the Defence Committee has not studied that investment or liability. I think the British people have a right to know why not.

[Mr Dhesi]

I have already stated, on two occasions, the various reasons why our Committee has not looked into this particular aspect. The matter has been given extensive airing in various other contexts, and we have been given assurances that there will be no fettering of our ability to operate from the base in the defence and security of the UK and its allies. I also point out to the hon. Member that during the Defence Committee’s recent visit to our most trusted and closest ally, the US, during various discussions and on numerous occasions when we raised the matter with very senior individuals in the US, whether on Capitol hill, in the State Department or at the Pentagon, they were supportive of the deal. I am sure that other Committee Members, when they discuss this, can attest to that.

[Sir Roger Gale]

We have been given an assurance from the Front Bench that no advance notice will need to be given about operational arrangements from the base. However, my hon. Friend the Member for Harwich and North Essex (Sir Bernard Jenkin) earlier indicated that there had to be Mauritian Government approval for the construction of facilities. How can we have the operational facilities without the construction of the facilities that back them up?

[Mr Dhesi]

The right hon. Member makes a strong point. Indeed, I hope that in the Minister’s winding-up speech, just as we have had clarification that we do not need to give advance warning about the operations of the US and our forces, he can give clarification about construction as well.

On the matter of cost, which is a concern rightly raised by hon. Members across the House, it is important to be transparent and precise. From my previous briefings with Ministers—I am grateful to both the Defence Minister and the Foreign Office Minister on the Front Bench for their time—I understand that that will be an average of £101 million annually over 99 years, with the United States covering all defence operations.

[Sir Bernard Jenkin]

I should clarify that what I quoted from article 4 of the treaty does not apply directly to Diego Garcia; it only applies to an area beyond Diego Garcia and for the development of land territory that is on the archipelago but beyond Diego Garcia. I should have made that clear. I inadvertently misled the House, and I apologise for doing so.

[Mr Dhesi]

I thank the hon. Gentleman for that clarification and for setting the record straight. I did not want to say anything on the Floor of the House that could inadvertently have misled the House, but my understanding was that all our operations regarding the Diego Garcia military base would be unfettered, so I am glad that he has given that clarification. No doubt I would have had to do more bedtime reading to catch up on exactly what was in the treaty.

While this arrangement will ensure that our strategic interests are protected, we must ensure that the cost does not spiral and that proper oversight is given to all the financial implications. Security and cost are not the only factors that we must weigh in evaluating this deal, however. We must also address the rights of the Chagossian people, including those who are in the Gallery today. I have raised these issues on the Floor of the House with the then Foreign Secretary, and I again urge the Government to ensure that all parts of this deal are carried out in line with international law and with full respect for the dignity and rights of the Chagossian community. I would welcome any comments from the Minister on ensuring that Chagossian voices will be heard.

One of the issues raised by the Chagossians, which the shadow Foreign Secretary also mentioned, is the protection of the Chagos archipelago, which is home to one of the most ecologically rich marine environments on the planet. I welcome the creation of a protection zone. This represents a significant step forward in our shared commitment to environmental conservation and biodiversity protection. It also provides a framework for scientific co-operation, marine research and community engagement, particularly with the Chagossian diaspora, whose cultural and historical ties to the islands must be respected.

I welcome the guarantees and stability that this agreement brings, but it is imperative that long-term stability is achieved and secured into the future. In an increasingly complex global landscape, we must act as a responsible global leader, ensuring that our national security and strategic interests are never compromised.

[Madam Deputy Speaker (Judith Cummins)]

I call the Liberal Democrat spokesperson.