See page 243 in Andrew Birkin's book:
"The battalion was advancing to drive the Germans out of St. Eloi [Sint Elooi in Flemish]... George was sitting on a bank with the others.. & died almost immediately. It was impossible to comply with his wishes and bury him there, [so] they took him and buried him in a field on the left of the road ... outside Voormezele ... and they took a lot of trouble making the grave look nice, & planting it with violets." His body was subsequently reburied in the British War Cemetery in Voormezele, so he almost got his wish.
Hope this helps. Do let us know how the grave looks when you visited.