When I was doing a PPL course at Scone in the early 70's there was a Maltese Air Trafficker who had to get a PPL to fully qualify as ATC.
He had been there quite a long time and still did not have that important PPL.
Anyway his instructors finally let him have a go at the qualifying X - Country on the same day as me - which in those days was up to Dyce (Aberrrdeen Scotland).
He followed me all the way up and I joined in turn into a very busy cct of very mixed traffic - but not this guy - he just went straight in and landed
Needless to say he wasn't allowed to do the return trip - we had to land and refuel (as briefed) but they had to send an instructor up to collect his wee Cessna