A course of "international" students bashing night solo circuits in JPs.
All very routine, but the guy in the battenburg box by the threshold (who was evidently less dozy than the ATCOs that evening) begins to feel something ain't quite right. Sure enough after a few more minutes he determines that there are too few JPs in the circuit to account for the radio calls, so he calls the Tower. Puzzled, they watch, and listen, and eventually call out the Station Patrol.
Who, on the dark side of the airfield enter an old revetment where they find, much to their amazement, a JP sitting there, lights off, engine running and stude Camel Officer Al-Bebuggad canopy open, fag in hand nonchalantly making circuit calls (in the correct places) while the clock ticked by.
Apparently he was scared of night flying.