Hi Jonathan
This is everything I can find at the moment. I'm sure you will have some of it

CWGC site
Name: BROWN
Initials: C A
Nationality: United Kingdom
Rank: Private
Regiment/Service: ALIAS
Age: 19
Date of Death: 07/05/1918
Service No: 41122
Additional information: See "BUZZA," the true family name.
Casualty Type: Commonwealth War Dead
Cemetery: ARNEKE BRITISH CEMETERY
Name: BUZZA, CHARLES ALFRED
Initials: C A
Nationality: United Kingdom
Rank: Private
Regiment/Service: Northumberland Fusiliers
Unit Text: 9th Bn.
Age: 19
Date of Death: 07/05/1918
Service No: 41122
Awards: M M
Additional information: (served as BROWN). Son of Charles and Mary Buzza, of 2, Park Avenue, Broadheath, Altrincham, Cheshire. Native of Eccles.
Casualty Type: Commonwealth War Dead
Grave/Memorial Reference: II. C. 16.
Cemetery: ARNEKE BRITISH CEMETERY
MIC on Ancestry He used the same name for both regiments.
Description Medal card of Brown, Charles A
Corps Regiment No Rank
Manchester Regiment 3/3638 Private
Northumberland Fusiliers 41122 Private
Date 1914-1920
Catalogue reference WO 372/3
Link
http://www.nationalarchives.gov.uk/documentsonline/details-result.asp?Edoc_Id=1644616&queryType=1&resultcount=1268If no one on here can get for you the cost is £2.00 to download it.
This is the section on the main site that cover's the 11th Battalion, if that is the one he was in
http://www.themanchesters.org/11th%20batt.htmThe 11th served with the Northumberland Fusiliers on Gallipoli
And his SDGW entry. click on it to make it bigger.
Seems he only used the name Brown
Timberman