In reply to Nick_Scots:
> And this one (on climbing crag map of UKClimbing).
Given that it's on the crag map, did you check out the linked log book entry for Torphin Quarry?
https://www.ukclimbing.com/logbook/crags/torphin_quarry-29987/
Doesn't make it sound particularly inviting.
I actually asked about Torphin Quarry myself 18 years ago (give or take a week or two). The response was not encouraging then, either:
https://www.ukclimbing.com/forums/rock_talk/torphin_quarry-131661
One thing in its favour: if you want to take a look yourself, you can get the number 16 bus to within about half a mile of the point along the track to Easter Kinleith where you can/could get over the fence. (I wouldn't try strolling in past the Tiphereth centre, which AFAIK still sort-of occupies some of the eastern part of the quarry floor with its compost-making operation and which may feel a bit proprietorial over access that way.)
Basically, though, given the relatively straightforward access from a city with quite probably a higher than average proportion of climbers amongst its population (not forgetting the student population attending the four universities in the city) I think it's fairly safe to say that Torphin Quarry has to date not been so much ignored as explored and dismissed - i.e. pretty much what Mark Bull said in the first reply to your OP.
Post edited at 18:24