In reply to SausageCreature:
And as you give quite a large radius, Big Rock in MK might be a reasonable option, as there are a lot of top-roped routes and almost[1] all lead routes have a screwgate and a snapgate at the top so you can put up your own top rope if you like, and you can lead on pretty much[2] every panel regardless of whether there is an in-situ toprope or not. There is also a mix of grades on each panel so you can do what you describe.
[1] There are a couple that don't, so look up first, or keep a spare screwgate on your harness to put your own up if you end up on one of those routes. Or trail another rope to feed through the maillon if you have two, or learn to thread a belay
[2] A couple of panels don't have quickdraws on the bolts because a lead fall would be dangerous, e.g. would cause a swing around the side of the wall. The new slab area also doesn't have them, but I don't know if it'll gain them in future.
Neil