In this month's newsletter from my apartment complex, they wrote a blurb about the American Revolution. It includes the sentence: "Many British consider the American Revolution to be one of the biggest mistakes in their country's history."
I shared that sentence with some Brits. One of them laughed his head off at the notion. The other one made annoyed muttering noises about how the problem with America is the non-aboriginal inhabitants of it, who ought to learn something about politics and history.
The one time I've heard a Brit comment other than that, it was to say that the colonists were a bunch of rabble rousers who were constantly starting conflicts with the natives that England then had to defend them from.