Hi Chico
I'd say if you're looking for quality, as per the above suggestions, the list should include Duncan Bickley at
Aeromega in Cambridge.
I should declare an interest; I instructed there for a couple of years, after doing my FI course there in 2011.
I found the FI course to be rigorous and, well, just seriously good. I came to it with 1000 private-owner hours in both turbines and in piston Robinsons, and learned a lot while flying with Duncan, both about how to teach and how to use the R22 safely as a training machine.
While working there I was encouraged to develop my skills further as part of a very professionally managed set-up. The whole ethos is sound.
Hope this helps.
UK