I did my PPL with Cabair in Elstree, getting by licence in February. While there are obviously a few instructors hour building there, others who have been around a good while. It took me about 18 months to get my licence, and during this time, I only flew with 3 instructors - one due to a circuit check prior to a solo navex, while another was an hour prior to the GST. I may not have been typical, but I basically did all my training with one bloke. Mind you, he's now flying with the airlines . . . however, there are still some cracking instructors there.
Cabair seems to have a bit of an unfavourable reputation, but they did fine by me.