I know a few people who have been learning to fly at Barton and the prices are actually more or less the same at Lancs Aero Club as they are at Ravenair. Ravenair do not quote the prices including landing fees VAT or touch & go's on the price list which is why the club probably look more expensive.
As far as instructors go they have about 20 at LAC. The people I know training with Lancs aero club have had had no changes. All except for one who's instructor left due to an airline job, and for first solo check as the new instructor wasn't authorised to send first solo's. If you don't get the same instructor each time you should be putting your foot down.
Very little time is lost now at Barton due to runway condition and surely that can only get better considering the money that is being put into the place by the new owners.
It's always worth having a trial with the schools you are looking at to see what you think of them before you fork out a great deal of your hard earned cash.