Count me as another vote for Dunkirk! Lots of targets for Stukas, and scrambling for CAP and air superiority over the area. Furthermore, there can also be some german ground troops pushing into the place, giving allied bombers a task too.
Alternatively, there should be some material somewhere in the BEF's France campaign that tied in air support, and it might get people started on looking at what can happen ground-war wise...
