Hi,
If either of them married or registered the birth of a child during their time in the Army, then you might find their number given as part of their "occupation".
Nanny Jan
Thanks Nanny Jan, great idea.
I checked my Great Grandfather, and he got married in 1915, with his Wedding Cert stating that he was a coal miner at that point in time (February 1915). On Ancestry.com I'm not sure where the link has come from, whether it was my sister from her research, but I've also got down for 1915 "Private in the Royal Irish Rifles (no. 288)".
In regard to my Grandfather, I've no idea what the dates were of his National Service, but know it was following WW2. He was married in June 1950, whereby it states his occupation as Colliery Maintenance Fitter. So I assume that this would have been following his return from National Service.