Hi Jon
I'm doing this reverse trip on Saturday/Sunday but using Dieppe to Newhaven crossing as I am staying with friends in
Newhaven where i used to live.  I like the viamichelin.com site for driving directions.  It will also give you an indication of fuel
costs, what tolls to pay if you choose the motorway routes and where the motels like formula1 and others are.
(oh and locaations of speed cameras  ;) )
Safe journey,
Haze