In reply to Shane jones:
There's a multi-pitch sports route near Bristol -
Schrodinger's Cat, Earl (6a+), the bottom pitch is only 6a and the top is a fairly soft 6b. You can also climb
Still Nice and Still Sleazy (6a+) as two pitches if you really want.
There's some at
Tintern Quarry but it's a dangerous place and the access is dubious.
I suppose I might ask if there's much point, multi-pitch sports climbing really isn't hard, just use a sling and screw gates to equalize a couple of bolts and belay. The only thing to watch out for is get the belay device around the right way and don't drop the rope or the belay device!
You might want to learn how to abseil safely if you don't know already, you can lower off multipitch but it's often cleaner to abseil off.