John Camarano & Dewey put on an excellent series of WWII games, in a what-if series of scenarios for Operation Sea Lion. Cleo & I played in their playtest (see Otto's article if you don't think play testing can improve your game) of the scenario, and from problems encountered there, several changes were instituted. 

Here we see one of the German gliders landing on the golf. course. That's where Cleo and I landed in the play test. I think after we were finished invading, England was safe.

In some of the later scenarios; the Germans were reinforced by tanks.

The Germans had to slug it out with their Panzer II's against British Crusaders --an uneven match.