Thanks for all your input.
The memorial was erected in 1923, so he is being commemorated for WW1. The problem we're having is linking him to the parish of Benholm and why he was included on the memorial. Here's the information that Chris has sent me.
"hi Jean, thanks for getting back to me.
The following is where I have searched so far:
a) Scottish National War Memorial. National War Memorial, Australian War Memorial, New Zealand War Memorial, Canadian War Memorial
b) 1891 and 1901 Scottish Census
c) 1901 English, Welsh Census
d) British Army Service Records 1914 to 1920
e) Canada War Graves Register 1914 - 1918
f) US Burial Registers, Military Posts & National Cemeteries 1862 - 1960
g) US Navy Casualities 1776 - 1941
h) All Canada CEF Commonwealth War Graves Register 1914 - 1919
i) Irish Casualities WW1
j) A&J Robertson (Granite) Ltd. They took over the company who erected the memorial.
k) Aberdeenshire Archives
l) Ancestry.co - British Casualties WW1
m) Find-My-Past, Scotlands People, etc. for deaths, marriages, etc.
n) National Archives where I found a few Edwin Nobles but all were with English Regiments (which does not in itself rule them out) but I could not find a connection back to the Parish
I have found two people with the right name, one died of influenza on Orkney is 1918, he was a gunner in the Royal Garrison Artillery but he came from Blaby in Leicestershire, so did his wife (Rachel Ellen Coxall) so I don't think there is a link there. The other one was in the Yorkshire Regiment and I have emailed the regimental museum for information and I'm waiting for a reply.
Regarding the memorial I believe it was erected in 1923. A guy in the village is the great-grandson of the man who collected the names to go on the memorial, however, I am told that he liked a good drink and I am wondering if someone played a practical joke on him or he was so sozzled that he got the name confused."
So that's where we are at the moment. if anyone has any further thoughts - please get in touch.
Thanks Jean