Ron Hayter used to do the ground school for Airbourne Flying Club when it was in existence - he did all my ground school and I can certainly say that he knows it very well!!
Derek Davidson is ex-CFI / owner for Airbourne and since he retired, he and his partner (Clare Guggenheim) do the ground school. Again, he's very knowledgeable and is CAA Examiner - has taken 000's through PPL training. Derek completed my PPL for me and did my skills test.
Don't know Reayair, but would say that if you go with either Derek or Ron, you'll get through your ground school OK if you can read / write / do sums!!!
