Thank you both so much for your help.
Egypt and Gallipoli are what I expected to find and it's nice to see confirmation of that. Also, confirmation that at home means in the UK because I then suspect he would have died at Military Hospital Codford, St Mary, Westminster.
It would be good to find out how and when he was wounded and/or departed Gallipoli (perhaps for Malta in the first instance?). Are there reliable sources on line that might hold the answers?
I've seen his name on the war memorial near the centre of Stalybridge. Edward and Mary (who would have been my Great Grandparents) probably met in Liverpool and started a family there. They moved to Huyton at some point and then to Stalybridge with their 3 surviving sons Walter (my Grandad), William Henry Gilbertson and Bertie who was in the theatre and, so they said, dated Hylda Baker.