Why not fly from London? (if it's cheaper!) Just arrange an overnight stay in a hotle or with friends the night before.
I'd still have the Ferry to "catch", and the saving is looking to be at least £100 per person.
Also, Scottland, I was looking at SeaFrance rather than P&O, but I haven't looked at norfolkline yet, cheers!
me and a mate got back from a roadtrip. on the big toll roads it was 1.55euro a litre and on the backstreets, at supermarkets etc it was 1.36. Keep off the tolls. Theres equally as good roads that run parrellel to the tolld roads that make for a more intresting drive.