How does ww2 not happen? No Nazis? Earlier Hitler death and collapse of the regime? Hard to play out a senario in the mid 40’s without specifying the political climate of the rest of Europe at least. If there is a right wing German government but not a Nazi or facist government then I can see the fear of communism pushing Western Europe into one camp against Soviet expansion. Persia/Afghanistan would be the areas of direct conflict in reguards to Uk/Soviet conflict but I suspect it would take a general war in Europe. Those two as sole combatants seems unlikely as neither would be secure enough of German intentions to commit to a all out fight. Neither side has any hope of conquering the other and would commit themselves to a fight on the periphery and would expose themselves to wearing themselves for little gain