Bear in mind that it's not actually an aerobatics rating you'll be getting - there is no such thing in the UK. Most schools offer the AOPA aeros syllabus as their aerobatic training schedule - do a search for AOPA Basic Aerobatics and you should be able to dig up a copy. If not send a pm and I will send you one.
Not a concern for most airlines I would say, but probably the best way to improve your handling skills bar none. Closest to you will probably be Prestwick but not sure about instructor availability. Ask at Carlisle as well, problem is you need reasonable weather so continuity can be difficult if you want to do it intensively. Further afield Tayside do the AOPA aeros course at Dundee as well, 5 fully aerobatic Grobs so aircraft availability good. Good luck - you won't regret it.