Yes they are on the Electoral Rolls and in 1949 there are a dozen or so Terrills in the same area.
I will start posting them
1935
Colin Elma Cheeses maker and Pamela May at Ararata Patea Taranaki
1938
Both at Patiki Road Pihama Taranaki Colin a surface man.
1946 Colin and Pamela same address as 1938 Colin still a surface man
Also Sydney Roy and Evelyn Terrill at Carrington Road He is a share milker
1946 Colin and Pamela Okoke Waikato Waitomo Colin a farmer
Also Ethel Margaret Kaipikari Road Urenui Spinster.
A second entry for Ethel M Main Road Kearuhe Spinster
I think there are two women with the same name. See later entry.