WHBM
Many thanks for that interesting response. The picture is an original contact print, on the photographic paper of the period, but he was definitely not the photographer.
I like to picture him in the WH Smiths, once he had dealt with the cables, while waiting to be invited to walk out to the aircraft, and picking up the picture as a memento.
Perhaps WH Smiths offered him a paper bag for 1d.
It would have compared favourably, in terms of comfort, to his 8 departures for Germany a couple of years earlier flying his Lanc; the final trip was a longish one to Belaria for 18 months with a long walk westwards to round it off.