Here is an obituary for Mary Alice Chaytor, per Debrett's People of Today 1995, she née Craven, m. Herbert Gordon Chaytor in 1947-
It notes he predeceased her, in 1992. Evidently Debrett's were not informed of his death for some time(?), at least not before the publication of People of Today 1995.
Given the British Columbia element (per the obituary and the People of Today entry, which gives his address as "1899, Deborah Drive, Duncan, B[ritish] C[olumbia]"), this would explain no evidence of Herbert Gordon Chaytor in U.K. death records, nor in electoral roll or related records.