Sustainable New Zealand Party leader Vernon Tava joins Heather du Plessis-Allan to talk about claims he doctored party records.

Former party secretary Helen Cartwright also criticised the party and likened them to a 'fast fail'.

Tava says he was shocked to learn the secretary concluded the party registration was not valid, suggesting records of financial members were false.

However he says he "thought out loud in an unguarded fashion" and floated ideas, but had such ideas "immediately discounted".

He says he was talking to somebody who he thought was a trusted advisor and thought outloud in an unguarded fashion - essentially brainstorming.

Tava founded Sustainable New Zealand in November last year, creating a party he hoped could link up with either Labour or National.

The party has failed to feature on public polling since.