It looks tidy, Similar to the one I bought last week for Price/Mileage/Spec. I can see its quite a road trip for you. I would email him and ask for a few pictures of the interior. Get a photo of the milage on the clock and some shots of the drivers seat and look for excessive wear.
Also make sure its HPI free, and ask if its been in an accident. If you go to view it look for any colour variation in the panels and overspray. Or if you dont know too much about what to look for get an AA road report done on the car for piece of mind. Its a long way to drive and alot of money to spend so get as much information out of the seller about the car before you go to view it.