And wyton is very active with AEF and other light aircraft - not the best of places to throw a glider into...use of a disused airfield is certainly a good option - if you have had a chance to check out the landing zone first its even better.
Indeed having had a student had to go-around on their 3rd solo sortie due a glider turning up un-announced at the airfield, and then proceding to 'dump' their aircaft such that one part of the nose was protruding into an active runway by 3' Im less than will to mix unless there are suitable operating procedures in place.
Places like RAF Halton the gliding/VGS/light aircraft/microlights mix very well - BUT ONLY because of well laid down procedures that are complied with.