Just as in the Oval Office this week, history shows the royals can be deployed to serve British interests – whether they like it or not

As Donald Trump waved his personal invitation from King Charles III to pay a second historic state visit in the Oval Office, there was no disguising his delight before the TV cameras.

Keir Starmer had retrieved the letter from his jacket pocket and handed it to the US president with the dramatic flourish of Neville Chamberlain’s “I have in my hand a piece of paper” moment.