Diego Garcia Military Base and British Indian Ocean Territory Bill

Lord Hannan of Kingsclere Excerpts

Tuesday 4th November 2025 Lords Chamber

[Lord Hannan of Kingsclere (Con)]

My Lords, we have an opportunity to right an old wrong and prevent a new injustice. We have an opportunity to stop the handover of tens of millions of pounds a year—billions in total—to fund tax cuts somewhere else while taxes are rising here. We have an opportunity to prevent the handover of strategic territory to a state that may come under the influence of unfriendly powers. Above all, we have the ability to stand up belatedly for the injured party here: the Chagossian people.

Sitting silently in the Gallery throughout your Lordships’ debate has been a contingent of our friends from the British Indian Ocean Territory. Their role as silent spectators has been eerily symbolic of the role they have played these past 50 years, and especially these past five years, as decisions about them have been made without them. But we have an opportunity to go in a different direction. Article 18 of the treaty makes it clear that it cannot enter into force until both parties have informed each other that they have concluded all the national ratificatory procedures.

I remind noble Lords one more time of what the Labour manifesto said about this. As my noble friend Lord Callanan quoted, it said:

“Defending our security also means protecting the British Overseas Territories … Labour will always defend their sovereignty and right to self-determination”.


I would argue that, under the Salisbury convention, it works both ways. You could at least make the claim that this Chamber has not just the opportunity but the duty to enforce the manifesto on which Labour was elected, and that means recognising the self-determination of the Chagossian people.

Why are we doing this? I will not repeat my noble friend Lord Lilley’s speech. There is no legal obligation. For one thing, military facilities are excluded from the purview of these courts, but even if you set that aside, it was expressly drawn up in the clearest language that our lawyers could devise that there was no purview for a court such as this in a dispute between two present or former members of the Commonwealth. That was expressly put in to prevent challenges of this kind.

I think we all know the answer—we heard it from the noble Baroness, Lady Hoey, a second ago. I cannot help noticing from the sparse Benches opposite that there is no great enthusiasm from the governing party for this measure, but there is a clique of people for whom “Decolonise” is everything. It is painful for them to see little union jacks in the upper corners of flags. They approach these questions impressionistically, based on vibes and emotions, almost regardless of the legal rights and wrongs or the interests of the people concerned.

It is very clear from Philippe Sands’ book, in which he wrote about the whole process, how he, the Attorney-General and, I suspect, the Prime Minister, have come at this. You must always back the ex-colony against the ex-coloniser, always back the poorer state against the western one, always back the non-white population against the white one, regardless of the rights and wrongs. This is even though the people being injured here are, of course, the dispossessed Chagossians. Even as a decolonising exercise, it totally fails on its own terms, because here is a territory now being handed to a genuinely colonial power that has no interest in it and no connection except a pecuniary one.

I will not get into the ecological arguments, which were so well stated by the noble Lord, Lord Thurlow, or indeed the strategic ones that we have heard from other people. To emphasise the wrong done to the Chagossian population, I just want to canter very briefly through some of the history.

The archipelago was uninhabited until 1783. The French then populated it with enslaved people taken from the African mainland. It was seized during the Napoleonic Wars—or rather, it was not seized, but the Indian Ocean French-speaking territories were seized—by the Royal Navy, as dramatically rendered in one of the Patrick O’Brian novels.

At the end of that war, in 1814, Mauritius and the Chagos Islands were ceded—separately—to the British Crown. The Chagos Islands were never part of Mauritius. They were administered from Mauritius because there was no suitable administrative seat in the archipelago.

I invite noble Lords to entertain seriously for a moment the argument that, because somewhere was once administered from somewhere else, that creates a sovereignty claim. By that logic, Anguilla would be part of St Kitts; the Turks and Caicos Islands would be part of Jamaica; indeed, come to that, Burma would be part of India. It is a ludicrous argument, an incredibly dangerous precedent that we are setting, not only for our fellow subjects in other overseas territories such as Gibraltar and the Falklands, but for any other country that was ever administered from somewhere else, which is a great many places on the planet.

Let us fast-forward to 1965. As we have heard, the Mauritian Government accepted and gladly pocketed the then huge sum of £3 million in return for renouncing in perpetuity any claim to the Chagos Archipelago. They were far from unhappy about that; this was a territory to which they were unconnected, and they saw this as an extremely good deal. I will quote what the then Prime Minister, Sir Seewoosagur Ramgoolam, said shortly afterwards. He said this was a territory

“of which very few people knew, which is very far from here, and which we had never visited”.

As far as he was concerned, that was that. The deal was done.

Mauritius then pocketed some further funds that were handed over by this country, supposedly for the betterment of the Chagossian diaspora, although a lot of that money somehow never quite trickled through to the people that it was supposed to help. Indeed, a lot of the bad feeling of the diaspora population towards Mauritius stems from the way in which those funds have been disbursed down the decades.

It was really only 15 or so years ago, as China began to become interested in Mauritius, that the claim was pressed again in earnest. There was a state visit from the Chinese Head of State, an unusual thing for a country the size of Mauritius. The first free trade agreement, I think, between China and an African state was with Mauritius. At that point, suddenly, Mauritius became very interested in exercising sovereignty over this territory, and can you blame it? It has been referred to aptly as the Malta of the Indian Ocean. Of the seven great naval choke points in the world, it is within reach of four of them: the Bab-el-Mandeb Strait, the Strait of Hormuz, the Malacca Strait and the Cape of Good Hope. It was from the Diego Garcia base in 1991 that the waves of B52 bombers took off to topple Saddam Hussein’s regime. It was from there that a brave part of the campaign against the Taliban was waged.

It is worth noting, if we are playing the game of decolonise, that for a diaspora Chagossian to dispute Mauritian sovereignty is an imprisonable offence under a law passed in 2021. Simply to say what I am saying would get me a spell in chokey if I were in Mauritius. However, there is an alternative solution, and it was touched on by the noble Baroness, Lady Foster. I want to put this forward because it is not just that we are stopping this; we have to have an alternative. It was one that was initially looked at when Tony Blair was Prime Minister. He commissioned a feasibility study by KPMG into resettling the Chagossian population on the outer atolls. The feasibility study came back much later and said that it could be done for the cost of £3 billion over a century, which, in a rather short-sighted move, the subsequent Conservative Government decided was too big an outlay during the time of austerity. But even if we accept the Minister’s figures on the liability to British taxpayers—and I suspect that my noble friend Lady Noakes is much closer to the actual sum—that is still a lot more expensive than putting in the infrastructure and resettling the Chagossian population as British subjects in a British overseas territory. Then, because it would be an inhabited territory, that would put the sovereignty claim for ever beyond doubt. It would then be up to the people there, and them alone, if they wanted to change their sovereignty.

When this Government took office, they promised growth. What we are seeing is that they are delivering shrinkage in every sense: economically, morally and geographically. If this Bill goes through and we compound the injustice to our fellow subjects of Chagossian descent, we will be in every sense diminished as a country.