William and his family were living Acomb, Yorkshire in 1921
This record is on fold3
William Gregory Barnes
Residence 12 Milner Street, Acomb
Service Number 102822, 269037
Corps, Regiment or Unit D of Wele Rgt, M. S. C.
Title WWI Pension Record Cards and Ledgers
Wm. Gregory Barnes Rank Private
Residence Place York
Military Service Region Yorkshire, North East
Service Number 102822
Corps, Regiment or Unit Machine Gun Corps
Service Branch Military (Army)
Title WWI Pension Record Cards and Ledgers
Description Prc Ledgers
There’s also this record from UK, World War I Service Medal and Award Rolls, 1914-1920
William Gregory Barnes Rank Private
Military Year 1914-1920
Regiment or Corps Machine Gun Corps
Regiment Number 102822
Medal Awarded British War Medal and Victory Medal
Added
Gregory Wm. Barnes Rank Pte
Regiment Machine Gun Corps
Regimental Number 102822
Discharge Unit Machine Gun Corps
Discharge Regiment Machine Gun Corps.
Badge Number B224435
Enlistment 16 3 1917 discharge 27 1 1919
UK, Silver War Badge Records, 1914-1920