I know the picture you are referring to Robin.
Funnily enough it is not included in the book Chronicles of a Nervous Navigator by John A Iverach
I have just had a quick look through his book but doubt I can give an exact date for your picture as the pic is not in his book - However Iverach was posted from 240 Sqn in Feb 1942 to travel to Calshot to meet W/Cdr Sofiano and thus start his tour with the clandestine Heinkel He115's.
He returned to Canada injured by 15/11/42 so the picture at Woodhaven would have been taken sometime between Feb/March 1942 and October/November 1942.
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