User blog:Imperium Guy/Brits in Stalingrad

I get it, its been a while and FP seems to be making all the blog posts. But I have a scenario stuck in my head and the good ol' blogpost seems to me the best way to get it answered, so here goes nothing.

Those familiar with PKD (or Philip K. Dick for those who do not Amazon Prime the hit show) would of course know The Man in the High Castle. In it, there is a senario where a combined British-Soviet force turns the tide of the second world war in Stalingrad. Now we all know how the war went OTL, but I would like to ask what set of circumstances would allow Britain to actually have been a significant aide to the Soviets in the war. Would it have happened in the Suez fell to the Axis? Or instead if the British won the Africa campaign a lot earlier? Or if the Japanese were not so significant or what exactly? Or maybe even that America never got involved in Europe at all.

Throw me all your thoughts and ideas on the matter. I look forward to hearing them.