Many thanks for the links Scrim, they make fascinating reading and I enjoyed the discussion of the pictures.
You have now got me thinking that if he was part of the British Army of Occupation then this may not be the part of his service record that triggered the mental health problems. I am now wondering if his troubles started when he was in the West Riding Regiment.
Before the war he was a hospital porter, so maybe he was something to do with the field hospitals, or even worse a stretcher bearer, and it was what he encountered that started the mental illness. But if this was the case then why didn't they send him home once the war finished?
There are so many unanswered questions and it is so difficult to find out information about ordinary soldiers.