There's more to it. In WWI with the huge number of volunteers between 1914 and conscription, men liked to be in local regiments, taken to the extreme in 'pals battalions'. It resulted in whole towns being depopulated of fit men of military age. The Newfoundland (Canada) battalion was such a victim.
I thought the Army tried to avoid this in WWII but 18th Division from East Anglia was captured entire in Singapore. 7 out of 9 battalions were from East Anglia.
However, in WWI mygrandfathers sisters stepson and son were in 7/N Staffs and 7/S Staffs Regiments respectively. The family were Forest of Dean but living in Newport, Shropshire pre WWI. Both were killed and they are recorded on the war memorial in Lydney, Glos. Son is also on the Newport war memorial. Stepson was master at a school in Kent, started the school corps and presumably lived there.