Less than one year after the
"Battle of Britain" Germany attacked Russia on June/21/1941 with 3 million soldiers, 3350 tanks, 7300 artillery guns and about 2000 aircrafts! IMO the Brits were just lucky that Hitler was an old lag and a hopeless ingenuous idiot who simply understimated the risk of a war on two frontlines and the importance of the
"USS Great Britain". Fighting the WWI he should have been aware of this.
On the other hand; thank god that the Brits were lucky !
P.S.: But it seems they spend all their luck at that time cause as far as I know they still have no chance to win a penalty shootout against Germany