British Indian Ocean Territory

Joe Robertson Excerpts

Wednesday 28th January 2026 Commons Chamber

[Dr Evans]

My right hon. Friend is entirely right in pinpointing some of the issues, and I will reverse my speech and deal with some of those first. On the 1996 Pelindaba treaty, formally ratified in 2009, although the whole treaty is about where countries can research and what they can do with nuclear weapons, the key part, article 4, is about the prevention of parking of nuclear explosives. Paragraph 1 states:

“Each Party undertakes to prohibit…the stationing of any nuclear explosive device”

on its territory. By definition, if the base goes across to Mauritius, it will be under the treaty, because Mauritius is a signatory. There is a slight misconstruing, because there is a specific carve-out. Paragraph 2 states:

“Without prejudice to the purposes and objectives of the treaty, each party in the exercise of its sovereign rights remains free to decide for itself whether to allow visits by foreign ships and aircraft to its ports and airfields”,

and it goes on.

What the treaty implies, and what it states specifically, is that Mauritius would have to be consulted and provide explicit permission for nuclear craft, whether submarine, boat or aircraft, to be there. Only yesterday we heard that that permission would not be granted. This question on the security of the nuclear aspect is unanswered, and I look forward to the Government trying to rectify that position, because they have not explained the interaction with the treaty. This is not operational; it is purely about legal text.

[Joe Robertson (Isle of Wight East) (Con)]

My hon. Friend is making an excellent speech, which contains more detail than the Government’s contribution. In a nutshell, is the fundamental problem not that when we give away British sovereign territory to another nation, we are vulnerable in perpetuity—whatever agreement we have sitting around it—to that agreement being torn up, disagreed with and not implemented?

[Dr Evans]

Absolutely. On a technicality, the Minister is right to say that the treaty in front of us has no problems, but at the end of the day it is about the interaction with other treaties once we have signed it and sovereignty has been given away. My hon. Friend is right that things would not be covered once Diego Garcia no longer belonged to us, and the Government are struggling to explain that difficulty.