That looks like an absolute nightmare that, I wouldn't touch it with someone else's bargepole.
It's covered in dents, the engine is overheating, which seeing as it's had a few radiators, means it's probably not the radiator, if you know what I mean.
It simply hasn't been looked after, and the fact it has no MOT (why hasn't he MOT'd it? is the underneath covered in rust?) should be a good pointer, and you'd have to get a trailer to tow it all the way from london, and the head will probably blow from that distance if it's overheating.
I can't stress how much you'll regret buying that heap of ****. I know of a fair few nightmare stories regarding R5GTT's. He'll sell it sold as seen, and you'll be stuck with it.
Harsh, but true.
edit: I've just read there's rust on the sill. It's knackered, don't buy it!