He died in the Mitcham Military Hospital (the Holborn Union Workhouse on Western Road) and his name is on the memorial.

From CWGC

Rank: Private
Service No: 25902
Date of Death: 05/01/1918
Age: 39
Regiment/Service: Grenadier Guards 1st Bn.
Grave Reference: 17. 100.
Cemetery: MITCHAM (CHURCH ROAD) BURIAL GROUND
Additional Information: Son of Mrs. Betsy Lee, of Bexhill; husband of S. Sullivan (formerly Lee), of The Garavan, Bosham, Chichester.

From CWGC

Rank: Driver
Service No: T/14687
Date of Death: 28/03/1919
Age: 41
Regiment/Service: Royal Army Service Corps 227th Coy.
Grave Reference: 7. 61.
Cemetery: MITCHAM (CHURCH ROAD) BURIAL GROUND
Additional Information: Son of Charles and Caroline Knight; husband of Kathleen Knight, of 109, Mandrake Rd., Upper Tooting, London. Born at West Ashling, Chichester.

His name is on the north face of the Mitcham War Memorial

See list of WW1 graves in the Parish Church.