Having produced the handbook on British Stamp Exhibitions with Graham Wilson, I can confirm that there is nothing to indicate that these have any connection with a specific, or indeed any, British stamp exhibition. They could, of course, have been handed out as suggested, though, but unofficially.
If you would like to download a free copy of the three-part 1,262 page PDF catalogue mentioned, then go tohttps://www.gbps.org.uk/information...ies-misc.php
GLENN H MORGAN
I greatly appreciate your generous offer to allow me to download your handbook for free.
I do have a few items definitely labeled with their association to some British Stamp Exhibitions, most probably more common ones.
There was a time I when I was collecting cinderellas produced not only in association with British Stamp Exhibitions, but also GB&BC in general, and more than just exhibitions.
They were a side interest to the postage stamps issued during the reign of KGVI that I was collecting.
I got reasonably close to complete (probably at the 90-95% level).
Most of what I was missing were the WWII Japanese occupation overprints.
I even had one of the Andaman & Nicobar occupation overprints.
But all that material was sold when I changed direction in my collecting interests.