Thanks all

Doullens makes sense - it's where he is buried

Thank you for the link to that site, Neil.
I'd been able to make out most of the entries, but I didn't know SW was Shell Wound, and couldn't read what it said after that (apart from "Fract Head") - now that you've transcribed it, I can see it does say Rt Leg, which would fit with the next entry mentioning the Rt Tibia.
The second last line seems to read "Still in 3 Can Sty Hosp - Doullens".
What do you think the entry means on 16.1 - "Concussion buried"? I can only think that he was buried under the debris from shelling or something, but surely he was still in hospital at this date? Do you think it might just be a later entry referring to his original admission on the 6th?
Thanks for all your help so far

PRue