In reply to victim of mathematics: Emulator at Gogarth is a good, sustained E1 corner (used to be HVS).
Suicide Groove (E1 5b, used to be HVS) and Rampart Corner (E1 5c) at Idwal are also good corners for practising bridging. Herford's Crack, also at Idwal (HVS in the Ground Up guide, but VS if you like that sort of thing) is a great straight-in jamming crack - much better than Bond Street!
On grit The Trident (E1 or HVS) at Wimberry would be a worthwhile target - a perfect jamming crack at the back of an overhanging pod, but it is possible to rest between moves, if you don't mind taking the skin off your knees. Someone else has already mentioned Long Tall Sally at Burbage.
I'd say both the ones you mention are low end HVS, so don't get carried away!