I have played a few times, but I have managed to take over UK on turn 2 of Germany. I built 2 transports on round one and I had enough plans and land invasion force to take out UK. That changes the game try that and you will see that the Allies will try to liberate UK, at that point you should be starting to push into USSR by Germany round 3 and since UK is a major factory dump a few man and fighters great defense, , I hope that helps.
I’m trying to find a way to avoid losing UK after round 2 of Germany.