As King Charles concludes his transatlantic travels with a visit to Bermuda, a British Overseas Territory, he can take pride in a job well done. His four-day state visit to the US – which concluded with a wreath-laying at Arlington National Cemetery and a block party in Virginia – appears to have been a success.

Amid a period of heightened tension between President Donald Trump and Prime Minister Keir Starmer, the king’s carefully calibrated speech to a joint session of Congress has secured praise on both sides of the Atlantic (and on both sides of the Congressional aisle).

It was a remarkable performance: careful, diplomatic, occasionally pointed and at times both charming and witty. Perhaps we should not be that surprised. The king is a highly experienced diplomat, and while this was his first address to Congress, it was his 20th visit to Washington – as he himself noted.

Read more: How King Charles charmed the US while taking digs at Trump

But what does the undoubtedly warm American response to the king’s visit mean for the future of the US-UK “special relationship”?

On its own, no act of royal diplomacy, however well executed, can deliver an instant reset in US-UK relations. Nor can it force an American president of any stripe – let alone the current incumbent – to change tack or alter approach.

On this, history offers a salutary........

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