London is the capital of England and the United Kingdom. As the seat of the British government and Parliament, it was where the decisions leading to the Revestment of 1765 were made, where the Duke of Atholl's representatives negotiated the terms of sale, and where the Purchase Act and Mischief Act were rushed through both Houses in a fortnight.

The Manx went there to be heard and mostly were not. George Moore came over from Peel on the Keys' business and found only Sir John Cust, the Speaker, warm in his sympathy. He was told by both Cust and the Duke of Atholl that once Chatham had been absent all hope of anything being done that session was gone, and he went home. Lord Clare at the Board of Trade was suspicious of the proposals and called the inhabitants of the Island's trading towns a nest of vermin collected from the dregs of the neighbouring countries. Hugh Cosnahan and his fellow delegates, arriving to learn what was being negotiated, waited on Hammersley the Duke's agent and told him the inhabitants were extremely ill used. In 1790 the Keys sent Norris Moore and John Cosnahan back again to oppose further compensation for the Duke, and Cosnahan made an able and brilliant speech at the Bar of the House.

The money and the paperwork were London's too. Edmund Hoskins of Lincoln's Inn was one of the two trustees in whose names the Island was bought, and the seventy thousand pounds was paid into the Bank of England. The lawyer Rolt was hired there in 1766 to draw Moore's case for the Treasury, and produced a document about the prerogatives of the Lord rather than the rights of the people.

The Island made one memorable appearance in the city. In February 1872 the Attorney-General, the senior member of the Keys and the Speaker drove to the thanksgiving at St Paul's in a carriage with the Three Legs painted on the panel, a symbol then almost unknown in London, and it attracted considerable attention.