I am fortunate to own an original photo of this picture which includes on the back the original caption, sadly undated. Copy attached
However it makes it clear that the photo was published to illustrate that a new uniform was to be issued to the Corps which is described, along with the breast badge for Head Observer, in Air Ministry Order A64 dated 15th January 1942.
The photo was published in the War Illustrated of 20th February 1942.
But does all this not pre-date the tests and badge for Master Observer?
Jon
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