Berrie Cameron-Allen's Page

I'm looking for an enlistment photograph of my grandfather, who was killed during WW1. I've been told that photos taken of soldiers on enlistment are held in the archives, but despite spending a very long time doing numerous searches, I've had no luck. Would anyone please be able to give me some advice on how to find this photo - none exist in the family, and I'd love to know what he looked like. Many thanks.