TakeFlight, based at Wellesbourne. Not just instruction, but a nice place to be a member when you are learning and after you get your PPL. They have a good range of aircraft and instructors. Mike and his team make big efforts to provide good facilities. No, I'm not on their staff!
Before and after you get your PPL, don't underestimate the value of networking and flying with other members. I think some schools are just training establishments.