This doesn't help directly, but he appears in the Absent Voters lists 1918/19 at Lynn Street, the same address he had for the 1911 census and the 1939 Register:
Name: George Frederick Richardson
Rank: Gnr
Electoral Date: 1919
Electoral Place: Wandsworth, London, England
Branch of Service or British Army Corps: RGA
Regiment: 124th Heavy Bty
Service Number: 101167
Medal Card:
https://www.ancestry.co.uk/interacti...cklabel=Return
Medal Roll:
https://www.ancestry.co.uk/interacti...&usePUBJs=true
Unfortunately, I can't find a service record, so it may not have survived.