In reply to Nicknackpaddywack:
Hi,
If you're willing to cycle a bit there's Auchinstarry quarry near Kilsyth. It's a nice cycle (entirely flat) along a canal and around 13 miles from Glasgow city centre. You could also bus there.
There's Craigmore, around 8 miles north, it has some short routes and bouldering. Cycling is along some semi-busy roads.
There's plenty of places you can get to via train that are then walkable from the station, Dunkeld is around 1hr by train and a 45 min walk to Polney or Cave Crag.
There are some quarries near Stirling (Cambusbarron). Haven't walked there from Stirling station but they are about 2 miles as the crow flies).