The RAF censors were geographically located within the UK between 1940 and 1942. i.e. Northern Ireland and Scotland. It was also used in Ice

The following is based on the contribution I made to the 50th Anniversary display we had at Spring Stampex in 2002. It has been added

Official mail – presumably from the UK – to the AOC, AASF, who was Air Vice Marshall P.H.I.Playfair. Interesting m/s endorsement in red