Talking of Bovingdon, I saw the first half hour of so of '633 Squadron' yesterday for the umpteenth time; amazing how you can always notice something not seen before.
In this instance in the opening shots, Cliff and Co arrive back from an operation and park right in front of a freshly painted helicopter landing circle and shortly afterwards, the camera pans towards the hangars and you see a rather conspicuous long wheelbase Landrover parked there, not even in camo colours!
NB For you younger people; helicopters hadn't been invented at the time of the 633 op and Landrovers weren't built until about 1948.
Course then there was the often used 'stock shot' of Mossies landing and in the background you could see a row of Ansons lined up all with shining white tops; I'm sure that would have been allowed in wartime!.