Frank AINSWORTH - marriages :
Yes, it would seem that he had a marriage in 1930 in New Zealand to an Ethel Mabel WOODFIELD.
A little searching found that she had been resident in Christchurch in 1928 (a spinster, living with her parents.)
What caught my attention though was that there was on the New Zealand Archives "Archway" website, a record of a divorce (ex Christchurch court) of a
Frank AINSWORTH v. Susan Cooper AINSWORTH - 1929 
It became apparent that this couple had not married in New Zealand ... and Susan Cooper AINSWORTH (or other surname) appears not to have resided at any time in NZ.
FREE BMD (UK) has the following marriage :
MARRIAGE - SEP - 1915
AINSWORTH - Frank
BAXTER - Susan C.
Reg'd. at Lancaster (Lancs.) It seems therefore that the NZ Divorce records relates to the Frank AINSWORTH who wed in the UK in 1915.
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~ Lu