The CWGC website does, of course, list the death of "A Doyle" on 12 Oct 1918 (S.S. Inverawe, Royal Naval Reserve). He was laid to rest in the Greenwich Royal Naval Cemetery (grave ref. C C 52). If nothing else, it might be worth finding out who this person was. Perhaps you, or some kind soul, could visit the cemetery and see if the gravestone reveals anything.