Hi Chris. I have added marriage and death references and a Find a Grave memorial to Albert's profile. When he married Christina, her surname was recorded as Haenel, so she may have been married before, but I have not found a corresponding marriage record in New Zealand.
Christina may have died in 1961. The following death record could pertain to her, with the order of the given names reversed. It might be worth purchasing a copy of the certificate.
<ref>New Zealand Te Tari Taiwhenua / Department of Internal Affairs [https://www.bdmhistoricalrecords.dia.govt.nz/ Births, Deaths and Marriages Online]. Death registration number: 1961/39741. Family name: Baker. Given names: Sarah Christina. Age at death: 74Y. [https://www.dia.govt.nz/Copyright CC BY 4.0]. Accessed 19 January 2023.</ref>
If we accept Sarah Christina instead of Christina Sarah, she may have been born in Daventry in Northamptonshire in 1887 (which matches an age of 74 in 1961):
<ref>[https://www.gro.gov.uk/gro/content/ England & Wales General Register Office, GRO Online Index - Birth] (accessed 19 January 2023), database entry for Tod, Sarah Christina (Mother's maiden surname: PHIPPS), GRO Reference: 1887 J Quarter in [https://www.ukbmd.org.uk/reg/districts/daventry.html Daventry] Volume 03B Page 107.</ref>