He and his wife emigrated to South Africa where Adelaide died in 1942.
He died in Witbank, Ermelo, Transvaal, South Africa on December 3 1953. 
The source records are consistent in giving his surname as Riddick and not Ruddick.
↑ England and Wales General Register Office GRO Online Index Birth (https://www.gro.gov.uk/gro/content) for
Riddick, William Cecl. Mother's maiden name Herd. GRO Reference: 1893 M Quarter in WHITEHAVEN Volume 10B Page 672 General Register Office, Southport, England(Accessed July 3 2021)
↑ "South Africa, Transvaal, Civil Death, 1869-1954," database, FamilySearch (https://familysearch.org/ark:/61903/1:1:WCNR-BQ3Z : 16 October 2019), William Cecil Riddick, 3 Dec 1953; citing Death, Witbank, Ermelo, Transvaal, South Africa, Department of the Interior. Registrar of Births, Marriages, and Deaths, Transvaal. (Accessed July 3 2021)