A new political survey appears to have picked up growing disgruntlement with the Government, leaving Opposition parties in the box seat - if they could work together.

Today’s New Zealand Roy Morgan Poll shows Prime Minister John Key’s National Party down two percentage points to 41.5 per cent - its lowest level of support in the poll since National swept to power in 2008.

Support parties were little changed overall with the Maori Party on 1.5 per cent (down from 2.5), ACT on 0.5 per cent (steady) and United Future 0.5 per cent (up 0.5).

Labour was up marginally at 33.5 per cent but the big movers were the Greens on 13.5 per cent (up 2), and New Zealand First on 6.5 per cent (up 1.5),

The Mana Party failed to register (1.5 previously) while the Conservative Party was steady at 2 per cent.

The combined Labour-Green-NZ First vote was 53.5 per cent, the highest combined vote for those three since 2006, giving them a clear majority if an election mirrored those numbers.

But there was also a possibility of a National-NZ First Government with some minor party allies.

The poll's measure of confidence found 44 per cent (down 3.5) saying New Zealand was "heading in the right direction" compared to 38 per cent (up 0.5) that say the country is "heading in the wrong direction".

The poll of 827 electors was taken between September 24 and October 7.

- © Fairfax NZ News