Thought it was all going tits-up as having looked the website for Quatorze and tried to book a room, it said no go!
Just in case the system was faulty, I dropped them a note and Valerie Chandler has just called to say at that time of the year they look for a two night minimum but given it is mid-week, they'll accommodate me.
So tomorrow, I'll sort my ferry booking.
If anyone else needs a room, they have others free and described a group with their classic cars who stayed there last year as "great fun" - shurely shome mishtake!