Could I just throw the name Neville Chamberlain out there. He’s the reason the world got into that mess. Britain really helped itself there. Also, the Germans never would have stood a chance against the US, even if England was down. Not to mention that we had to hold of Japan on our own pretty much while fighting the Germans. Also, I don’t think one mission qualifies the SAS to be any better than Americans.
Having said that, England’s war contribution was massive, and I have no intension of downplaying their importance in saving lives. Had they lost, more lives would have been lost, but Germany still would have fallen, thanks to the Russians, mostly.