A check on the Commonwealth War Graves Commission (CWGC) website shows several soldiers with the number 31620 but no MURRAY.
There is a Lance Corporal 21060 Thomas Christopher MURRAY, Wiltshire Regiment died 9 April 1916 on the Basra Memorial.
If you have any further information on your Thomas MURRAY (parents, when and where born, where he lived, and so on) it could help to find him after 1918.
Philip