Buying blind is the new way. I'm mid 30s. Lots of people I know do this and have done for a few years now. Had I have seen this car in person, I lose DSR protection and I'd have not got underneath too much. I'd go as far too say most wouldn't either.
These inspections that are mentioned, only any good if they are local to the car. Otherwise you have to buy it then go from there. If that's in person, recourse is limited.
The good news for me is the distance selling regulations are present so even if the dealer, who as I've mentioned above, seems to have a good reputation, doesn't willingly help, I can force his hand. Albeit, it can take weeks and court action.
I'm off to another friends garage now to take another look.
No one has yet answered my question though, how much better can one be bought for £20k..... Reading other threads, rust seems to be an issue.
Thanks for all the replies, I'll keep posting updates