Ok, I did a quick search and found him as a temporary Captain in the Home Guard (assuming hg is the Army List abbreviation for Home Guard) in 1942.
I didn't find him in the casualty lists.
Attached is a page from the army list, he's in the first column, 10th from the bottom. I've no idea what the crossed swords or W.S./Lt. mean.
I also found him in the Grantham Journal 18/7/41 - Grantham v Egerton Park, WG Butteriss bowled out by Hill for 53.
At his father's funeral in April 42 he's a Major according to newspaper above.
S2_US_MCV_ARMY_ARMYLISTOCTPART121943GREA_0669.pdf