AA Proficiency Badges

Dear All,
I have been researching WWII RA Searchlight Regiment and AA Regiment Trade/Proficiency badges worn by our chaps and now have several Searchlight (SLO in a wreath) type variations.
However, I've just come across a 'P' within a wreath and I believe this might either be WWII Plotter, Fortress Plotting Room (Coast Artillery) or a WWII Predictor (Anti Aircraft Artillery).
This I believe was worn by RA and ATS personnel attached to Coastal Artillery and AA units?
Can anyone confirm or otherwise please?
Many thanks,
Ken 👍