Toad, I haven't yet firmed up travel plans. But this year myself and Mark travelled Dover Calais on Sunday in an Omega towing my caravan. We stopped overnight in Gace and were on MB certainly by lunchtime Monday. We travel from Wokingham Berks, along M3/M25/M26/M20, although I haven't priced ferries yet so it's conceivable that we might do the Long Crossing (Portsmouth to somewhere) if the price is right.
I'm going to Munich with Mark next w/e (to meet up with GAB!), and will be deciding plans then, if you might be interested in sharing costs then we might have a spare seat (or do you need more than 1?). You'd need to come somewhere suitable to meet us, as I am not planning to drive my caravan round London!
This depends on me receiving some tickets from the ACO of course! Let me know if you might be interested.