As told to me by the very ATC officer involved-

Circa 1985, at RAF Lossiemouth on the coast of the north of Scotland one morning during a NATO combined forces maritime exercise, he had a call from a NATO callsign and the conversation went something like this:

Lossiemouth approach, this is Dogtooth One

Dogtooth One, position for a downwind join, circuit height 1000 feet, QFE 998, call tower on stud 5.

Lossiemouth approach, err, Dogtooth one is the aircraft carrier HMS Ark Royal!



He got a massive cheer when he went into the bar that night, very red faced.