Here's one for PrawnCocktail.
He was in the Territorials before WW1 (5th Cheshires), and left them in 1913,
Territorials did 4 years service + 1 on reserve. Once completed he would have been "time expired" & the rule at the time was these men couldn't be recalled even in wartime. This changed in 1916.
As has been said just because you can't find anything doesn't mean some of your menfolk didn't serve.
The 1918/19 ER is the way to find out for those over 21 at the time.
Apart from what's already been said about being deemed unfit to serve there was also a minimum height of 5' 3".
This led to near riots in recruitment centres with men ( a lot of them miners ) being turned down for this reason.
A Royal Warrant was granted & Bantam Battalions were formed for these men but too late for a lot of them.
There were no reserved occupations in WW1.
The RE took in thousands of miners as tunnellers.