Thank you Mike.
I recorded some notes when I spoke with Webley's former Works Manager the late Tom Cooper in 1997 but I did not press him on the logic behind batch or Assembly numbers. I now wish I had done as the only notes relating to this aspect I made were around tracing individual assemblers from the numbers, should a quality control issue be discovered. Tom was a fascinating man to talk to and there is so much more that I wish I had asked on that and several subsequent occasions.
Kind regards,
John