Service Records or documentation for Gilbert John Davis

[ANDREWCOOK]

hi,
I hope someone can help me I am researching my family tree and in our history my grand father now pass on, was in the 5th Worchester regiment and stationed at Harwich and possible other places, I would like to find out all I can about him and when and where he served. his details are, Gilbert John Davis born 20 Feb 1892 and died 15 Dec 1970, I think he served from maybe 1911 onwards, any information would be gratefully received,
many thanks
Andrew cook