I flew an R22 into Coventry a couple of weeks ago, and agree with all that it's a great place to visit! ATC and GA Terminal were both very helpful / friendly.
Landing fee was something bizarre like £9.78 ... computer generated total of ATC / Approach / Landing / Handling fees.
I generally expect to pay £5 at a small field with little / no facilities, £10 at a larger field with decent facilities ... don't remember being asked for more recently.
RC