£700 in central London! That has to be a studio or council flat!
Have in mind CPL training and PPL training are 2 different cups of tea. PPL is a hobby, CPL is for motivated and professionals.
It might not be heaven on earth, but certainly teaches you a lot, and I have nothing negative to say about the CPL training - from my view quality. Instructors, briefings, flights, training, nothing negative to say. Have heard of people complaining about PPL training there, but you can not compare PPL and CPL - it's totally different things.