I have done all my flying through Firecrest, from trial flight to license, when I lived in Hemel Hempstead.
Not only are they helpful and knowledgeable, they are encouraging too. I had an instructor that would bend over backwards to answer any questions I had.
I fully agree with x933 - the atmosphere is a great especially to learn in.
Flying wise the aerodrome has its quirks, but that only makes visiting other fields easier.