Who do you trust? Bill English came out on top of the poll overall, but Jacinda Ardern led amoung women.

Prime Minister Bill English is the party leader most trusted to do what he says, according to a poll published on Friday, with new Labour leader Jacinda Ardern close behind.

When people were asked "which of these politicians do you trust most to do what they say they will do", English was chosen by 31 per cent of respondents, while Ardern came in second with 26 per cent.

There was a large gap in the Herald-ZB-Kantar TNS poll back fo NZ First leader Winston Peters in third with 14 per cent, while remaining party leaders were well down in low single figures.

Opportunities Party leader Gareth Morgan topped the also-rans, in fourth with 4 per cent. Behind him was former Greens co-leader Metiria Turei on 2 per cent, United Future leader Peter Dunne on 2 per cent, Act leader David Seymour on 1 per cent, and Maori Party co-leader Tu Ururoa Flavell, who did not rate. Twenty per cent of respondents were unsure.

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The online poll of 1000 respondents began on August 2 - the day after Ardern took over as Labour leader. It finished on August 8 - before Turei resigned as the Green's co-leader on Wednesday.

While both the Green and Maori parties had co-leaders during the polling period, the survey only included Turei and Flavell - the most senior of the co-leaders in terms of experience and party list ranking.

The poll found strong gender differences, with Ardern favoured by 30 per cent of women and 22 per cent of men, while English was picked by 35 per cent of men but only 27 per cent of women.

Asked who should be prime minister should a Labour-NZ First coalition be in government, 47 per cent of respondents chose Ardern, 13 per cent wanted Peters, and 28 per cent said it should be the leader of whichever party had the largest party vote.