In reply to street_alex:
I've been climbing in this style a lot this year, in your grade-range, and have had good volume on every outing. Occasionally I've had to abort when a team arrives at the bottom, but it hasn't been a real problem.
Symonds Yat: trees at the top, which is very close to the carpark. The Golden Fleece area is perfect. When I was there, four of us were top-roping! Good for mileage...
Wildcat: trees at the top, and the top pitches are often the best. Quite difficult to work out which route finishes where unless you know the crag.
Ippikins: tiny crag not far from Telford, similar to a bit of Symonds Yat. Very close to the road. Closest option to Birmingham!
Grit: easier to work out routes. Often I've been able to do two routes with only minor adjustments. Hen Cloud, Black Rocks, Laurencefield, Birchen Edge, Gardoms, Bamford, Froggatt as well as Stanage and Burbage North. Nice to have the chance to try some unprotected routes that I wouldn't dare to lead!