Rob,
That design of badge does not feature in KK vol 1 or 2, or Gaylor as I can see.
Nor is it I believe included in Michael Wood’s wonderful Essex Yeomanry albums or his excellent website on the subject:
https://www.essexmilitarybadges.uk/y...n-and-gunners/
It is however present in Martin Marsh’s fake catalogue. I believe it’s a fantasy item.
Regards Luke