Bathroom: Tiny compared with the flat size at 6' x 4' - I would have hesitated to wash a dog in it, full refurb needed
Kitchen: Again tiny at 10' x 6'. Again, rip it out and start again condition.
Living Room: I'd say they were chain-smoking in here for all the 33 years. Lots of work needed incl floorboards, but worst of all though was the bulging/cracked plaster work across the ceiling and (very detailed) cornicing/ceiling rose so would require specialist plasterer etc. This room would cost a small fortune to rectify due to the (admittedly impressive) size.
Main Bedroom - Huge. Again needs full refurb. If possible would try to steal some space to give to Bathroom/Kitchen as the built in cupboards back onto those rooms but I didnt look to see if the back wall was load-bearing which it well could be.
Second Bedroom: Nice condition, sensible room.
All windows needed refurbishment or replacement.
No central heating and no mains gas in the flat. The owner wasn't a fan of gas and didnt want it so the supply was terminated on the floor below. At the opposite end from the Kitchen.... Currently heated by electric panel heaters.
Exterior stonework very bad at top floor level above living room window, which wasnt mentoned in Home Report. Together with various stuff that was mentioned, I'd expect a big communal bill in the near future and bear in mind theres only 4 flats sharing that bill.
I'm no expert, but I guessed that you could sink at least £50k+ into this flat to get it to the standard required and more to rectify communal areas - maybe even more considering I didn't look too hard into cupboards/floorboards etc as I usually do this on a second visit.
The owner's wife has cancer and could no longer manage the stairs so I'd guess that £200k would have bought it. On balance, in a falling market, it was no for me.