Right, I think I've found the answer elsewhere on the interweb:
post #13
https://www.britishbadgeforum.com/fo...ead.php?t=1144
As I understand it, the shoulder title composed of just two rows of wording is post war. The yellow wording on dark green background likely dates to 1942.
That leaves two options that are correct for the time frame. The flashes with either
XII on top, or
12 D in the center would both be alright, the differences are just a matter of where they were made?
Thanks for the interest everyone.
regards,
Jack