Yes, "winning" as in not being completely destroyed, occupied, and maybe even enslaved. Check out what Poland looked like in 1940 when it lost, or what Germany looked like in 1945, or, well, 1949.

USSR was also terribly battered by WWII, and its leadership was not highly competent either; I'd say both parameters were much worse than UK's. But it managed to remain a large empire with a high economic potential, and UK could not.