I have been in touch with the Office of Public Works in Dublin and have visited the people who maintain the cemetery. They were able to find for me the plot number and provided a photocopy of the register entry.
What is suprising is that my cousin photocopied for me a letter written by our grandfather to our grandmother in April 1915 and gives his address as 3 RDF, Victory barracks, Cork. In the letter he makes reference to going off to fight the Turks, but in the cemetery register he is listed as "late Royal Lancashire Regiment".
I have now to access the National Archives site here in UK to try to track his service.
Thanks for all assistance.
BillK