First given name from New Zealand Electoral Roll when searching daughter, Christine - Stratford Main Roll 1972, found in June 2020:
Astwood, Florence, 36 Stafford Street, Waitara, married
Astwood, William, 36 Stafford Street, Waitara, pensioner
Astwood, Christine Joy, 36 Stafford Street, Waitara, Nurse [Daughter]

Confirmed as wife of William, year and country of marriage from search on New Zealand BDM website in June 2020:
1938/10490. Bride: Florence Bliss. Groom: William Astwood

Full date of marriage of 16 July 1938 from further searching in June 2020 on BDM Search by incrementally changing the date range for the marriage.

Year and country of death, date of birth, from death search on New Zealand BDM website in June 2020:
1982/43267. Astwood, Florence. Date of birth: 11 November 1911

Full date of death of 19 August 1982 from further searching in June 2020 on BDM Search by incrementally changing the date range for the death.