Round 1: Nazi Germany vs British Empire
Round 2: Nazi Germany vs USSR
Round 3: British Empire vs USSR
What if no other allies intervened, how would a war between these nations go. Assume each is at their strongest during or just before WW2 and internal rebellion is non existent, all other countries don't have armies. Especially interested in hearing thoughts about round 3 as Churchill apparently planned an invasion of Eastern Europe after WW2. How would that go for a solo effort by Britain without American aid but say with pre war capacity, budget and full compliance from all Dominions ans territories (assume they've been promised full independence in return)