Hello,
I live down the road from this cemetery and happened upon the grave of your grandfather yesterday. I was intrigued by his age and also by the fact he is buried next to Gunner George Chandler, died aged 40, who also served in the 222 Searchlight Training Regiment and died on the same date as your grandfather (and therefore presumably in the same incident?).
When searching the name of the regiment, this website and thread appeared, and I was just wondering if you had since found further information about your grandfather.
If you have since received further info and don’t wish to share with a stranger, I understand!