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John Roper burial is in Burials over to the left. Bertha is probably in the same grave but our trancriptions stop short of 1957
Presume you mean the one who died in 1945 aged 70. buried in City Road.
FamilySearch.org City Road index of cremations https://www.familysearch.org/ark:/61903/3:1:3QSQ-G9FH-8TR?i=52&cat=444385 Image 256 has: 1957 28727 Roper, Bertha, age 76, July 4.
cheers Terry