Many thanks for your replies Shane, Adee and Elwyn!
Shane, I'm sorry I've not responded to your post before, I don't think I can have received a notification. I shall have a look on Ancestry as you suggest

Adee, yes I do have access to Ancestry and have looked again at his WW1 records. Thanks for pointing out that 'Discharge' is replaced by 'Trans' each time - I'd not noticed that before. The reference to malaria is interesting too, this man was my great uncle and I remember him from my childhood but was never aware that he had malaria. I shall have to ask my father if he knew.

Elwyn, that's very kind of you to check Jim Herlihy's book, I await your reply with anticipation

Best wishes, Heather