Harry was a Stoker on HMS Royal Oak. The tragic loss of this ship is documented on this website:
http://www.hmsroyaloak.co.uk/
and also by the BBC at:
http://news.bbc.co.uk/1/hi/scotland/north_east/8291329.stm
This is the detail given on the Commonwealth Graves Commision Website
In Memory of Leading Stoker HARRY GLASSPOOL
P/K57401, H.M.S. Royal Oak, Royal Navy
who died age 37 on 14 October 1939
Husband of Lilian Gladys Glasspool, of Trowbridge, Wiltshire.
Remembered with honour
LYNESS ROYAL NAVAL CEMETERY