Thanks Ady and Scrimnet
I know the gentleman in question suffered from the effects of a gas attack during the war, from which he never fully recovered, so it would fit in.
It would seem unusual to my untrained eye to have two men sitting for a photo together like this. Was this usual, or is it likely that they were brothers/cousins.
I will try to get a better resolution picture for you tomorrow, but thanks again for your efforts so far.
Nick