The marriage of Robert Rrichard Mackinson Innes is not on the historical BDM site.
It only covers marriages 80 years prior, however I do have a CD which covers NZ marriages up to 1956. In 1935 the following marriage is listed;
Robert Richard Nakison Innes to Ngaire Leila Lewis
This matches his wife's first names on trhe electoral rolls.
Another variation on his third name!