I was too young, when my grandfather, WJC King, died, to ask him about his experience in WW1. He was born in 1880, so would have been of an age to serve in the armed forces but there has never been a mention of his service. He was a fitter working for a gas company in the early years of the 20th Century, so he may have been in a reserved occupation and have no war record.
Is there anywhere I can find out if he did serve or not?