Hi window-seat -- must be a good news day today or summat!
The only obvious thing missing off your list is something like a pullover or jumper... according to Mike it can get down to 5 degrees over winter! Admittedly not exacly arctic conditions but still....!
I think flying down there is the only sensible option for me - I spoke to a guy in Malaga the other week who drove his family down. He reckons 11 hours for France, 11 for Spain plus whatever in the UK. He said it wasn't easy and he had the luxury of a convertible Beemer!
Don't know if you've been down there or not, but most of the cars seemed to be local jobs (either hired or bought - I'd guess the latter)... with the obvious exception of the black Z3 and the silver Elise!!
Not looked into moby options yet... I might just keep the Orange contract I've got and see how the bills turn out after a month or two.
I've got the email address of one guy down there already, so I'll drop them a note asking what the basics are...