Thanks for your quick response. I thought that but a picture in Monty's Ironsides by Patrick Delaforce shows soldiers with a similar badge but with a 3 in the middle, and is captioned men from 7th Field?? Maybe caption in book is wrong?
My eyes are not what they used to be (and it's the cheapie Chancellor Press reprint) but the shoulder title in the photo (p135) looks more like Royal Signals with a blue/white arm of service strip (light/dark colours opposite to RA). 3 Div Sigs would have had men attached to 7 Fd Regt, so that may explain the caption. That's my second guess! (Clock's ticking, Sol :p)
7 in Diamond indicates 92 LAA Regt RA (3 was 7 Fd Regt, 4 and 4H was 76 Fd Regt, 5 was 33 Fd Regt, 6 was 20 ATk Regt) And 1 was HQ RA 3 Inf Div
I was interested to see these RA badges identified as being from 92nd LAA Regiment. The sequence of badges I have for 92nd LAA (photo attached) includes the red rose of Lancashire, indicating that the regiment was originally a battalion of the The Loyal Regiment (North Lancashire). However, the wearer in this picture is an officer, so I wonder if officers' badges differed from those of other ranks? You can see my history of 7th Loyals / 92nd LAA on the Unit Histories section of WW2 Talk and (with quite a few photographs) at Home