Dont forget the instrument approach at Cranfield is not only outside CAS it is also procedural and hence aircraft in the hold and on the approach are not on radar (except we squawk so that Coventry can see us easily). At Farnborough they can at least see what is going on, at Cranfield they can't. I have seen aircraft barrelling through the approach whilst I have been on it, so always talk to Cranfield and they will let you know what is going on around the CIT hold.