As far as I remember anyone’s allowed to wander round the runways and perimeter track but the buildings (those that are still there, not many) are fenced off.
Actually, all the land inside of the perry track is MOD property, so you dont strictly have the right of way to this area, but its not as if the place is brimming with security, or anyone is going to stop you, the airfield is only used by 615 atc gliding (at least it was anyway). Not so long ago, local plod used to regularly patrol the airfield and boot off anyone inside of the perry track. The officer quarters are listed and fenced off because of yobs. they never used to be fenced off.
MJR