Even though the Germans are well represented the Do-17 is needed as a flyable too. The battle was really Spits and Hurricanes vs the three main German bombers (He-111, Do-17 and Ju-88 ), with the 109:s and 110:s protecting them...
Having said that, the Wellington would be nice as a flyable, and the Hampden, and the Beaufighter, and the Whirlwind
Mazex