That was a bit before our time i think Steve.
It lives on , I see,
EGLN London/Heathrow (Southern Area Maintenance Unit).
BTW Re Croydon. Wasn't one of Luton Flying Club's Moths the last aircraft to land there, after the airfield had officially closed? An engine problem or WX?
Happy days; Phil Jeffrey and me in a C150, but we didn't have the suffix 'heavy' then