From CWGC

Rank: Private
Service No: 61663
Date of Death: 01/11/1918
Age: 19
Regiment/Service: Suffolk Regiment 1st/6th Bn.
Grave Reference: G. 9.
Cemetery: MITCHAM (CHURCH ROAD) BURIAL GROUND
Additional Information: Son of William and Sarah Ann Marshall, of 50, Wadhurst Rd., New Rd., Battersea, London.

From CWGC

Rank: Serjeant
Service No: 11159
Date of Death: 17/03/1920
Regiment/Service: Royal Garrison Artillery 121st Heavy Bty.
Awards: M M
Grave Reference: S.11.
Cemetery: MITCHAM (CHURCH ROAD) BURIAL GROUND

Forenames from Ancestry:

Ancestry.com. British Army WWI Service Records, 1914-1920 [database on-line]. Provo, UT, USA: Ancestry.com Operations Inc, 2008.
Original data: The National Archives of the UK (TNA): Public Record Office (PRO).