I didn't have a second viewing because my vendor was so nervous about Covid.
I think it is wrong you can only find out everything by asking the explicit question. I didn't ask the right questions, definitely caveat emptor for me.
If I had had a second viewing I would have:-
looked closely at the kitchen cupboards/worktop. I thought they were wood, they aren't, MDF with plastic.
checked that the vendor had keys for all the windows, and they all opened/closed OK. I assumed she had keys and moved into this bungalow thinking I'd find them somewhere on completion - apparently she 'wasn't given them' when she bought the place. Cost me £300 getting all the handles changed.
turned on each tap, bathroom sink and bath
run the shower
flushed the toilet
asked how old the boiler was, and whether it was serviced regularly. I would ask for it to be switched on so I could see it working.
asked how old the smoke alarm/heat detectors were, and ask to see them working.
asked to see the white goods being left work - dishwasher, fridge freezer etc. I would have asked for instruction booklets.
asked if the vendor knew of any woodworm, whether they had done any work to the floors, and what the floors were made of - wooden floorboards/chipboard. All the floors here were rotten, not picked up by my L3 survey because of fitted carpets/heavy furniture. £15K to replace all floors.
Good luck with the viewing, I hope it meets your expectations.