Diego Garcia Military Base and British Indian Ocean Territory Bill

Debate between John Hayes and Tim Roca

2nd reading
Tuesday 9th September 2025 Commons Chamber

[Tim Roca]

I believe that the hon. Member has had quite a lot of turns today, and I have been waiting a long time without intervening, so I will proceed. If we allowed a vacuum to be created, it would be filled by China or others in a region that is vital to our security. I will come back to China in a moment, because what China thinks about this treaty is important as well.

Turning to the first test, the treaty secures 99 years of guaranteed access, with the option to extend it by a further 40 years; 99 years was good enough for Lord Salisbury, so it is good enough for me. It gives us full operational control over installations, logistics, communications and the electromagnetic spectrum. It establishes a 24-nautical-mile buffer zone and bans any foreign military presence on the outer islands. We have talked about how it protects a unique maritime environment and provides tangible support through the trust fund for Chagossian communities. On the first test I am satisfied.

On the second test—whether the agreement commands the backing of allies and experts—other colleagues have spoken powerfully about this, but Lord Goldsmith, a former Attorney General, said it was

“consistent with our national security interests and with our respect for international law”.

The international support is equally strong. Australia’s Kevin Rudd called it a

“good outcome for Mauritius, for Australia, for the UK and for our collective security interests”.

Canada’s foreign ministry said that it ensures

“the long-term, secure and effective operation”

of the joint base, strengthening a free and open Indo-Pacific.

In the United States, where there is not much that gets bipartisan support, it is a bipartisan matter. Antony Blinken said that America “strongly supported” the negotiations. Secretary of State Marco Rubio commended the “leadership and vision” shown. The Democratic former Defence Secretary Lloyd Austin said that the agreement will

“safeguard strategic security interests into the next century.”

I believe an hon. Member has already quoted President Trump, who described it as an amazing deal, a beautiful deal or whatever kind of deal—but a good deal, that is the main point.

The international consensus is clear. Our allies, partners and experts back the deal. I was very taken by the comments of Professor Benjamin Sacks of the RAND school of public policy in the United States. He said:

“I contend that Beijing privately views the agreement, even if modified to ameliorate some Chagossians’ outstanding demands, somewhat as a setback. In practical terms, it gains little if any advantage from it.”

He added:

“The Chagos issue constituted a perennial problem for British foreign policy; one that China could simultaneously exploit to demonstrate its supposed adherence to existing RBOs”—

rule-based orders—

“and undermine the UK’s traditionally important role in maintaining it.”

He also said that the deal deters Port Louis—Mauritius—from becoming an effective client state of Beijing. On the point of whether our allies support it, I believe that the treaty meets the test.

[Sir John Hayes]

Will the hon. Gentleman allow an intervention?

[Tim Roca]

I will not. I experienced the right hon. Gentleman defending the hereditary principle last week, and I do not think I have the strength in me this week to listen to another argument.

The final test was on costs and obligations. Again, Ministers have talked powerfully about the deal being less than 0.2% of the defence budget. Comparisons have been made with what the French are paying in Djibouti, and I am glad that we are getting a better deal than the French. Of course, Diego Garcia is 15 times larger than those bases and in a more strategic location. The treaty gives us immense operational freedom. It therefore seems to me that this is a modest investment for an irreplaceable asset. The risks from delay or abandonment—in this argument, we have to balance the treaty with the risks of what could happen—are vastly greater.