Hmm, in that case, perhaps it's not actually my great grandfather. He was born in 1884. He was identified as 'Jack Monckton' by the local history group that owns the photo and my great grandfather was John Thomas Monckton.
I'm thinking now that it may be my great grandfather's uncle, also John Monckton who was an older step-brother of my 2x great grandfather James. He is listed as 34 in the 1881 census as an 'agricultural machinist'.
All of which, I suppose, makes it an even longer shot to identify my Great Grandfather, but here goes! Max D, his name was John Thomas Monckton, he first landed in France in early 1917 where he joined the 10th Lincolnshire's (Grimsby Chums), seeing his first action at Rouex.
He fought through to March 1918 where he was taken prisoner during the second day of the German Spring Offensive, near Bullecourt. He had reached Limburg an der Lahn POW camp (Dietkirchen) by May of that year, apparently as part of a shipment of invalids with illnesses and non-combat injuries. He was erroneously listed by the Germans as 'James Monckton' and apparently had 'oedemma des Beines', or swollen legs - possibly due to malnutrition.
There is no record of a transfer to another camp, but according to newspaper entries he was back in England by mid-to-late December.