I just accidentally stumbled on the discovery that there are actually just a few 'C' records on the Ancestry WW1 pension database. There are supposed to be just 'A' and 'B'.
A little persuasion has discovered:
Francis Cox
James Bishop Cook
Edwin Cooke
John Caul
William Cowley
Barrington Leonard Cull
Thomas Cain
Patrick Carr
It may be worth doing a search just in case.
Paul