AQR were great value, Paul who coaches with them is excellent as is Ian and Kate (note: I wasn't coached by kate but my wife was).
My wife went with Cyclewise (when I was injured) and thought Richard was excellent, mind you he was best man for a friend of ours who is also a good mountain biking coach so possible bias (but the wife is picky about coaching).
Also Clive Forth is good, picked up a couple of great cornering tips and some original thoughts on riding from him in about 50 mins of riding and 10 mins of conversation when a friend who knows him suggested I tagged along for a social ride. I'm planning to have a proper coaching session with him if I ever get properly fit.
Also based on reputation and having crossed paths with Ed-O when he's been leading other groups the wife and I are having a days riding/coaching around Calderdale with him.