I expect that all ambassadors will have to resign as they all send reports back to the UK that are honest.
There was a series on radio 4 where they went back in the archives and broadcasted examples.
"Ministers in the Foreign Office told us we have actually quite a small diplomatic service in the United Kingdom compared with other European countries like France. And because it's small, it needs to rely on its public servants being completely candid in the advice they give back to ministers so that they know what's really going on."
Sir Anthony Rumbold, who was based in Bangkok from 1965 to 1967, wrote:
"I have very much enjoyed living for a while in Thailand. One would have to be very insensitive or puritanical to take the view that the Thais had nothing to offer. It is true they have no literature, no painting, and only a very odd kind of music — that their sculpture, their ceramics and their dancing are borrowed from others — and that their architecture is monotonous and their interior decorations hideous. Nobody can deny that gambling and golf are the chief pleasures of the rich — and that licentiousness is the main pleasure of them all. But, it does a faded European good to spend some time among such a jolly, extrovert and anti-intellectual people!"
Roger Pinsent, the British ambassador to Nicaragua, just before he left the post in 1967:
"There is, I fear, no question but that the average Nicaraguan is one of the most dishonest, unreliable and alcoholic of the Latin Americans."