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

Confirmed as husband of Florence, 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:
1983/37347. Astwood, William. Date of birth: 13 February 1901

Full date of death of 9 July 1983 from further searching in June 2020 on BDM Search by incrementally changing the date range for the death.