'Twas in ATC at Leeming late '60s. Preston Centre (as was) on blower in state of high dudgeon. There is a JP doing aeros in the middle of the airway (Amber "?") ... Can't contact him ... Have had to stop takeoffs at Manchester ... Is he one of yours ?
Called suspect. "Get a Practice Fix !" - Our Bloggs all right - he'd put his FL on his compass instead of his hdg - and flown that !
Red faces all round .....