Many, thanks to Mara McDuff who must have looked at this previous post http://forgottenpoetsofww1.blogspot.co.uk/2014/12/poets-who-were-prisoners-of-war-during.html
because she very kindly contacted me via the Facebook Page for Forgotten Poets of the First World War to send me this link to Lt. John Still's work : http://gallipoli-descendants.tumblr.com/post/109575923363/john-thesiger-from-staines-on-thames
Lt. Still was in the East Yorkshire Regiment and I am now doing my very best to find out more about him for an exhibition panel, etc.