Trump's approval rating in this country is sub 20%, the idea that he'd win swathes of the North is absurd. But I agree with TiltsAreUnderrated that he'd probably be strongest in places like Essex and coastal communities in the East of England, though not enough to actually win any region.
The approval relates to Trump the person from an outside perspective. Give Trump the Tory leadership and he does just a little worse than Johnson (the worse being the suburbs Johnson managed to hold for the Tories).
Trump would do better with the Tory leadership, but our electorate is much less polarised, even more so now than during the Brexit crisis. Even during that crisis, Labour massively overperformed in large part because of an awful Tory leader.
As someone in favour of single-payer, even I'm not 100% on board with the level of unquestioning support for the way the NHS works in this country, but Conservatives must absolutely commit to supporting it. It's probably more of a state religion than our actual state religion. I could see Trump shifting economically left outside the confines of the Republican Party, but he would not have the self-discipline to avoid making some statement about defunding bits of it that he found objectionable and that would be instant game over. His social security plans would also infuriate the pensioners who decide most of our elections.
