I think the VAT receipt thing only applies when you return to the UK, and if the boat looks brand new. I could be wrong though. I also think the SSR superseeds it.
I had looked up Calis in the Almanac and we would have a 2.5 - 3hr window to get into the lock and back out on one tide - still possiable this time of year then i think? But better to stay overnight there.
Had also decided Boulogne might be better, although i've never been there - not even in a big boat!
My final conclusion was, however, Dunkerque would be the best place to go "for lunch" especially from Ramsgate area, weather permitting it's only 45nm (all open sea though), they list Petrol (can anyone confirm this) although my Theoretical range is about 200 miles.
What do you think Mike, JCW? What are your fuel ranges?