Hello Keith
I can't answer your question, but strange coincidences do happen, or
someone sent him the photo.
I have found the following
Welcome to the forum. Is your grandfather's service number 7994?
With regards to Captain Wilfred Keith Evans the following information is from
his sons bio, at this link.
http://www.themenbehindthemedals.org.uk/index.asp?page=full&mwsquery=(%7BPerson%20identity%7D=%7BEvans,%20MPE%7D)
Museum of the Manchester Regiment The Men Behind the Medals
Wilfred was serving as an officer in the Manchester Regiment when Michael was born. He held the rank of Captain and was the Adjutant at the Regimental Depot in Ashton-under-Lyne during 1914. Michael spent the first year of his life there. Later he would become a Brigadier General and Colonel of the Manchester Regiment. He died in July 1934.
He joined the 2nd Battalion with the following officers
Capt Hardcastle, W K Evans, A G Tillard, W G K Peirce
and 2/Lt M R Davidson (murdered after the second World War)
joined on the 16th Sept 1914.
Patrick joined with 2/Lt Hugh de Putron on the 5th Sept 1914 with the
first reinforcements from base.
Is the following link to your web site, if so it is very informative.
https://www.roscommonstanley.me.uk/direct-line/manchester-regiment-initial-service/Timberman