Saltby (Lincs) runs an annual aerobatics comp and, I think, provides training (certainly did a couple of years back). Still some way from you though.
I would expect there to be an aerobatics instructor at Derby & Lancs (Camphill) because it's a big club. Email the club secretary via their website.
Bowland Forest is also near you, but I've never visited. But you never know.
If you're prepared to travel into bandit country, I'm almost certain there's an aeros instructor at Sutton Bank (Yorkshire!).
[Edited for afterthought: If you go to Gliderpilot.net (
Glider Pilot Network > uk.rec.aviation.soaring) and ask there you will quickly get an answer]