Dover - Dunkurque is looking the best bet. I'm trying to do this on the relatively cheap as there are 3 of us and flights to Bremen are coming in at £500 from Heathrow and then the hassle of getting there, parking etc. I'm going to the Hannover region, so expect an overnight stop somewhere on the way
Cheers for all your help - its given me plenty of food for thought
If the cost is the only thing putting you off flying you can usually get cheap flights with ryanair from Stanstead - Bremen.