So... I drove the 90-ish miles back home from picking up earlier today with no issues.
Here are my first impressions:
The Drive - pulls well, brakes well, sweet revving, slick gearchange (excellent synchro), precise steering, no noises, vibrations or rattles etc. After 70 miles of motorway, I spent 40 minutes in traffic and there were no temperature issues and the oil pressure was good. It wasn't an exciting drive (A12, M25, South London) but I had a big grin when I got back.
The Interior - The seats and carpets are a bit tired, but it's all complete and functions as it should. Nobody's put holes in the door cards or rear shelf, all the dials and gagues work and are illuminated properly; indicators, wipers (don't intend to use them very often!) heater, demister, hazzards etc all fine. Steering wheel, gear knob, window winders etc are all correct and all the badges and pieces of trim are intact.
The Body - Not had a detailed look yet, but the repairs that have been done seem to have been done properly. Exterior panels are good, wheel arches, engine bay, boot floor, jacking points all good. It's been waxoiled regularly. There is a very small amount of bubbling at the top of one of the doors and near the wipers, but look superficial. I think all the glass is original. Paint wise, its OK... the roof hasn't been done brilliantly and some areas are tired and there are a couple of stone chips... although I may be being overly harsh on it. Will have a good look tomorrow in proper daylight. (Incidentally, I'm still 50/50 on the colour - it suits the car in a 70s kind of way, but wouldn't ideally have been my choice. I'm all for keeping the car original, but would value people's opinion on a colour change)
History - There isn't any, which is a shame - a couple of old MOTs and thats it. The car has 5 previous owners.
Overall - delighted
It's now safely tucked up in a warm garage.
BTW, chap who sold it was fantastic - very accomodating and even filled her up with fuel and threw a box of spares into the boot before I left. Micky - if you're on here, thanks very much !