Mike
In your reply to my original posting you said that you hadn't been able to trace service number 14920, the one immediately preceding my grandfather's number.
If you go to a great site www.inmemories.com you will find a listing of cemeteries and you can search on various criteria including service number.
From this 14920 refers to Private G. W. Saxelby of the Lincolnshire Regiment who was killed on 10/12/1915. I have confirmed this on the CWGC's site.
I haven't looked into what part of the country he came from.
regards
Bob