In reply to Fruit:
I think it is remarkable that we haven't seen and acts of major misguided bolting on grit. Obviously buying the equipment is a barrier but even so grit has stayed almost completely bolt free whilst many limestone crags have been developed or routes retro bolted.
I've done a few grit routes here and there and have only come across a handful of new bolts all in Lancashire. With the rest being historical most aid bolts.
I've compiled the following list of locations of grit bolts, any that I've missed there must be some I've forgotten in some grotty quarries?
Guillotine (E3 5c) - has new unnecessary double bolt lower off just to its right at the top, there is 2 bolts on a line to the right of it climbing what looks like the remains post rock fall of Shudabindun
Supercrack (E3 5c) - has a probably unessarry but helpful new bolted lower!
Mein Kampf (E3 5c) - new bolts placed on this is crap hard to clip locations not like for like replacement, hangers have apparently been removed
Troy Quarry - lots of unessarry bolts for belaying at the top as there are stakes & natural placements.
Top Loader (E7 6c) - old aid bolts
The Cat Test (E6 6b) - old? On this or on wall either side of.
Turtle (E1 5b) - old
Baron Greenback (E9 7a) - old aid studs!!
War of the Roses (E4 6b) - old aid bolt.
The Roost - new - lower offs so you don't top out and cause access problems.
Plenty old/new at Hoghton Quarry
Not grit but a bolt (no hanger) has been placed in the last few months on the Cromlech boulders
Post edited at 15:26