What about no, what about it's impossible; the "mighty" british empire was, at this point, turning into a paper tiger. It had been outpaced by Soviet Russia and Nazi Germany, which kind of says a lot about the efficiency of colonialism to modernize a region that was developing proto-industrial textile production when inefficient totalitarian regimes are still more efficient than you.
America, by 1945, could easily beat the British. In fact if Britain tried to pull this shit it would be occupied and stripped of every single colony it has in a short while thanks to the number of american troops close by, and the French and Soviet armies as well, the population would revolt, the dominions would tell the crown to fuck off, and Roosevelt and Stalin would think Churchill is more deserving of an asylum than a tribunal.