Surname from death search of wife Olive Marie Trainer, found in May 2019.

Given names from New Zealand Electoral Roll - Manurewa Main Roll 1969, found in May 2019:
McGill, Alfred George, 78 Gloucester Road, Manurewa, retired
McGill, Olive Marie, 78 Gloucester Road, Manurewa, housewife

Year and country of death, date of birth, from death search on New Zealand BDM website in May 2019:
1976/48738. McGill, Alfred George. Date of birth: 5 March 1897

Full date of death of 22 July 1976 from further searching in May 2019 on BDM Search by incrementally changing the date range for the death.