Serving onboard the HMS Arrow, Charles William George Allman died on 4th August 1943, which wikipedia says was the day it set on fire by the explosion of the merchant ship Fort La Montee while in Algiers harbour. He was a mssage coder with the Signals Corp.

From the 1939 Register, he lived with his parents at 35 Hawthorne Avenue:
Charles W. Allman, born 3rd May 1896, leather dresser
Daisy C. Allman, born 12th December 1893, housewife
Charles W.G. Allman,born 18th August 1924, iron moulder improver
Source: The National Archives; Kew, London, England; 1939 Register; Reference: RG 101/1373D

His father died in 1981 at the same address.

From Commonwealth War Grave Commission

Coder
ALLMAN, CHARLES WILLIAM GEORGE

Service Number P/JX252956

Died 04/08/1943

Aged 21

H.M.S. Arrow
Royal Navy

Son of Charles William and Daisy Caroline Allman, of Mitcham, Surrey.