So much for the “special relationship”, then. Only a few weeks after the British rolled out the red carpet and threw every bear-skinned guardsman they could find at a state visit for Donald Trump and his family, he – this childish, petty man – turns round and treats Britain like a vassal state?

Imagine if Donald Tusk, Jean-Claude Juncker or Michel Barnier had Tweeted that would not “deal with” British diplomats or ministers because they had said disobliging things about them? Or that the EU had a shrewd idea the British intelligence services had been conducting some light surveillance on the Brexit talks?

Imagine the outrage at such insults to British dignity. The anger would be unbounded.

Or what, now, if Emmanuel Macron had decided that the British ambassador to Paris will no longer be invited to dinners at the Elysee Palace because our new prime minister, Boris Johnson, had, when foreign secretary, described the French as “turds”?

Trump, we know by now, doesn’t do irony. But the British do, and may at least extract some wry amusement from watching a man criticised for being inept, dysfunctional and clumsy, giving such an inept dysfunctional and clumsy response. It rather proves the ambassador’s point

Trump 2020 launch: Fascist Proud Boys, baby blimps and Uncle Sam Show all 30 1 /30 Trump 2020 launch: Fascist Proud Boys, baby blimps and Uncle Sam Trump 2020 launch: Fascist Proud Boys, baby blimps and Uncle Sam Members of the Proud Boys, a fascist group, jeer at anti-Trump protesters outside of the president's 2020 campaign launch in Orlando, Florida Getty Trump 2020 launch: Fascist Proud Boys, baby blimps and Uncle Sam A supporter dressed as Uncle Sam poses at Uncle Sam Reuters Trump 2020 launch: Fascist Proud Boys, baby blimps and Uncle Sam A baby blimp rears its head amidst a group of anti-Trump protesters outside the president't campaign launch in Orlando, Florida Getty Trump 2020 launch: Fascist Proud Boys, baby blimps and Uncle Sam President Trump addresses supporters at the launch event of his 2020 election campaign in Orlando, Florida Reuters Trump 2020 launch: Fascist Proud Boys, baby blimps and Uncle Sam Proud Boys have adopted Fred Perry polo shirts as their uniform and 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Trump 2020 launch: Fascist Proud Boys, baby blimps and Uncle Sam A Proud Boy shouts across the police line at anti-Trump protesters outside the president's campaign launch in Orlando, Florida Getty Trump 2020 launch: Fascist Proud Boys, baby blimps and Uncle Sam A Trump supporter poses for a photo at the president's 2020 campaign launch in Orlando, Florida Reuters Trump 2020 launch: Fascist Proud Boys, baby blimps and Uncle Sam A Proud Boy jeers at anti-Trump protesters who are separated from the president's supporters by a police line outside the president's campaign launch in Orlando, Florida Getty Trump 2020 launch: Fascist Proud Boys, baby blimps and Uncle Sam A man dressed as Uncle Sam poses at President Trump's 2020 campaign launch in Orlando, Florida Reuters Trump 2020 launch: Fascist Proud Boys, baby blimps and Uncle Sam An anti-Trump protester faces off against a supporter outside the president's campaign launch in Orlando, Florida AFP/Getty Trump 2020 launch: Fascist Proud Boys, baby blimps and Uncle Sam Members of the Proud Boys, a fascist group, jeer at anti-Trump protesters outside of the president's 2020 campaign launch Getty Trump 2020 launch: Fascist Proud Boys, baby blimps and Uncle Sam A child holds a 2020 US "dollar bill" that features Donald Trump's face at the president's 2020 campaign launch EPA Trump 2020 launch: Fascist Proud Boys, baby blimps and Uncle Sam Anti-Trump protesters rally outside the president's 2020 campaign launch in Orlando, Florida Getty Trump 2020 launch: Fascist Proud Boys, baby blimps and Uncle Sam Anti-Trump protesters rally outside the president's 2020 campaign launch in Orlando, Florida Getty Trump 2020 launch: Fascist Proud Boys, baby blimps and Uncle Sam Numerous baby Trump balloons are raised in protests outside of the president's 2020 campaign launch in Orlando, Florida Getty Trump 2020 launch: Fascist Proud Boys, baby blimps and Uncle Sam A supporter wears a T-shirt depicting Trump as a hero at the president's 2020 campaign launch in Orlando, Florida Reuters Trump 2020 launch: Fascist Proud Boys, baby blimps and Uncle Sam President Trump addresses supporters at the launch event of his 2020 election campaign in the Amway Centre in Orlando, Florida AFP/Getty Trump 2020 launch: Fascist Proud Boys, baby blimps and Uncle Sam An anti-Trump protester calls for the president to be impeached outside the launch event for his 2020 campaign launch in Orlando, Florida Getty Trump 2020 launch: Fascist Proud Boys, baby blimps and Uncle Sam Supporters of Donald Trump face off against protesters outside of the president's 2020 campaign launch in Orlando, Florida AP Trump 2020 launch: Fascist Proud Boys, baby blimps and Uncle Sam A baby blimp rises behind a group of anti-Trump protesters outside the president's campaign launch in Orlando, Florida AP Trump 2020 launch: Fascist Proud Boys, baby blimps and Uncle Sam A supporter dressed as Uncle Sam poses at President Trump's 2020 campaign launch in Orlando, Florida AP Trump 2020 launch: Fascist Proud Boys, baby blimps and Uncle Sam A member of the Proud Boys, a fascist group, holds a sign up outside of the president's 2020 campaign launch in Orlando, Florida AFP/Getty Trump 2020 launch: Fascist Proud Boys, baby blimps and Uncle Sam A supporter bears a Trump flag at the president's 2020 campaign launch in Orlando, Florida Reuters Trump 2020 launch: Fascist Proud Boys, baby blimps and Uncle Sam Protesters hold baby Trump balloons in the rally outside of the president's 2020 campaign launch in Orlando, Florida Getty Trump 2020 launch: Fascist Proud Boys, baby blimps and Uncle Sam An anti-Trump protester holds a sign accusing the president of being a traitor Getty

It also substantiates the more significant point that Sir Kim Darroch made in his supposedly confidential emails: that the UK can expect no special favours on trade, or anything else, from this “America First” administration.

If the British think that they can leave their strong and productive relationship with the EU and look for bright new deals from the US (or, dare one suggest, China or Russia) then recent events may remind them about what a small player the UK now is – and how much smaller it will be out on its own in the world.

In the EU, the British still have a powerful say over affairs with close neighbours and our largest market; we are partners. With America, China or Russia we are at best uneasy acquaintances.

Already we can feel the diplomatic chill. The world becoming a lonelier place to defend British interests. As another, earlier, leaked memo, from the departing High Commissioner in Singapore, expressed: "The nation Singaporeans admired for stability, common sense, tolerance and realism grounded in fact, they see beset by division, obsessed with ideology, careless of the truth, its leaders apparently determined to keep on digging.". Much the same goes for the rest of the world.

The UK needs to get real about its clout. It is in real terms, allowing for exchange rate distortions, only about the ninth largest economy in the world – not the fifth or sixth, as so often parroted. If and when the Brexit slump arrives, and Scotland and Northern Ireland leaves our union, then the new United Kingdom of England and Wales will be lucky to be in the top dozen. The UKE&W will have about the same GDP ranking as Mexico or Brazil, the difference being they are growing emerging markets, not mature stagnating ones. The EU, China and the US are all about 10 times larger by GDP than the UK.

(We are not half as rich as we think, by the way. The UK ranks around 24th in GDP per head, the real measure of wealth so far as individual long term living standards are concerned – way behind the likes of Norway, Australia and Hong Kong).

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But what about Trump’s claim that all will be well once Boris is prime minister and, as he once suggested, Nigel Farage is our man in Washington? Sorry, but no: as Sir Kim wisely stressed, America still comes first. Trump merely judges that these two would be amendable to accommodating US interests, and will do as they’re told.

If Boris tries to stand up for British interests where they diverge from America, he too will end up trashed on Twitter as “Bumbler Boris Stone Cold Loser” or some such. Remember that Trump was once a hand holding fan of Theresa May. It didn't last.

The answer? We could send the US Ambassador to the UK, Robert Woods, home for saying that Donald Trump is a “visionary” as retaliation. Or ban him form Buckingham Palace. Of course it wouldn't happen. The British are not as spiteful in diplomatic relations but, more significantly, the Americans are bigger than we are and we need them more.