Hello John
There is a rule when researching the IY which you won't know if you are starting out:
If a first name is not listed on the available sources, e.g. Asplin lists (noted above by Mike) or The Register (
www.boerwarregister.com) then look at the British Army Service Records 1760-1915 on findmypast.co.uk.
In the very many cases I have looked at this works every time, and again in your case..........the first name is Cyril.
You can download the papers from FmP - no need for a researcher!
Regards
Meurig