What are the full details on the Death Cert?
If he died in a Base Hospital in Rouen, then I wouldn't expect him to be evacuated all the way from Italy.
His CWGC entry puts him in 14th Brigade RHA, which was part of Third Army Artillery. At the Armistice the 3rd Army held a line between Cousolre and Rouveroy.
Unfortunately, as he died post-Armistice, there is no entry in SDGW to back it up.
The war diary for 14th Brigade is in WO 95/385, which although it probably won't name him, will confirm their location.
Phil