My great grandfather served joined up in 1913 and from what i can find served in the Royal Berks Regiment till 1916 when he was injured and then the Labour Corps. These photos are supposedly from that period but he must be the oldest looking man in his 20s ever! I know he was a security guard after the war and i wondered if these uniforms had anything to do with that? Here's a link to his service recordsand photos as the site won't let me upload any!!
http://www.flickr.com/photos/63709042@N07/sets/7215762909548...