PN, found that flicker link:
https://www.flickr.com/photos/933036...816378/detail/
Never heard of the Photo Trg Flt orgn, it must have been recently cranked up after the School of Photography was blown away in the name of efficiencies, but some of their cam scheme interpretations are way off the mark.
Caveat still applies - I doubt there would be anyone in today's air force (like the RAF) who are putting these details out and who would have detailed knowledge of WWII markings.