How could Britain remain as Europe's dominant economic power after WW2? Leaving Germany to just catching on Britain's coat tails? I think such a scinario would be quite difficult, because you would probably need a low tax-low regulation Britain to foster a continous period of stable economic growth. Not the boom and bust growth that was seen throughout the 50s and 60s. A Tory or Liberal win (coalition perhaps) in 1945 could be a way, but this would require a substantial amount of revisions of Churchill's action's prior to the war. I think, overcoming the declinist British mindset, and the lack of drive and ambition in British indsustry, would be the main and hardest obstacles to overcome.