In reply to Edition:
I know you said that you didn't find Shipley Glen easy but I'd suggest it's worth a revisit. The 'John' area has a large concentration of easier climbs. Some other areas are a bit highball and some are full of tougher climbs but it's a good venue, when you get to know it.
I see a few people have suggested Widdop. There's one particular boulder that is good but I think it's generally lacking in F3 and F4s. It's great once you're at F5 and upwards. Beautiful place to be though.
Buckstones has to be the best choice as there are so many F3 climbs and many of them have easy top outs - both above and below the road.