I recommend ATA. I went there in 2001 and passed them all first time. Instructors are good and really care. They go out of their way to get the good info to you. Your part of the bargain? You must put in the effort. Coventry is good for that because it's a tad err well... it's Coventry.
Note: the Old Mill is very good at relieving you of some cash if you have any spare.
I can't seem to escape Coventry, I now fly out of there a few times a week.