At the Covert Oxonian Aerodrome, the Flying Club is right next to the Air Cargo hangar.
One fine day, a CAA chap who worked at Oxford Airport dropped by to fly my Instructor Revalidation check on his way home. As he'd come straight from work, he was in NATO blue pully with 4 large gold rings, white shirt, black tie and black trousers.
The same uniform as worn by HMRC.
A few of the Movers went as white as sheets as they thought that a surprise Customs check was about to kick off. I had a chat with their WO who thought it was excellent fun - "Let the bug
.gers panic - it'll help me find out who the bad apples are!" was his comment.....
CAA chum was ex-RAF and also saw the funny side.