Plan A did strike me as ambitious but well done on doing the legwork and research Hedge...
Presume a more practical plan is to drive to a ferry, take the ferry to somewhere, drive to another ferry over the course of a few days, get that ferry back to the UK and then drive home from the ferry.
If so, where do ferries go to? Spain/France to the south; Holland/Scandinavia (too cold, given the obligation of aeros?) to the east; Ireland to the west and nowhere really to the north?
On that basis, I like the idea of Ireland... am familiar with their beer
but what's the food like?