The GPO issued a series of 'Green Papers" during the 1930s – “primarily for the information of staff…” and “to place at the disposal of its officers up-to-date and accurate information…”. They were also 'forwarded post free to any interested member of the public". This, the 24th in the series (the 'A’ stood for 'postal and general’) was about the work of the Travelling Post Offices" that ran on the UK’s main railway lines.
The covers were re-designed at about this date (1936) to use this striking design instead of an earlier very bland cover. Sadly no artist or designer is given.
According to publishing records, this one is dated March 1935.
None of the issues I’ve seen have any credit for the designer. The latest issue I have with the cover design above is No. 41 dated July 1938, but I don’t have any after that until No. 46 from May 1939 which reverts to the old GPO logo.
Thank you, Bill!
Contributed by Quentin Schmerber
Contributed by Artyom Geller
Contributed by Chris Purcell
Contributed by Carolina Giovagnoli
Contributed by Stephen Coles
Contributed by Florian Hardwig
Contributed by Gareth Hague