Mike
why didn't the Luftwaffe take the air war to Bomber Command? Infiltrate a few JU88s into the stream back to the UK and lurk over the airfields; tired bomber crews, aircraft low on fuel, airfield landing lights etc.
Maybe they didn't think it was a good idea.
Why go all the way to England to be shot at by nightfighters when all the targets they could handle came to them, and they got to take a shot before the bombs were dropped.