An explosive poll shows National has reached its lowest result since forming a Government, as Labour climbs ahead.

The Taxpayers' Union-Curia poll has Labour on 34.4% as National drops six points behind to 28.4%. 

The Greens are on 10.5%, with NZ First trailing slightly on 9.7%, ACT on 7.5%, and Te Pati Māori on 3.2%. 

Director of Sherson Willis, Trish Sherson told Kerre Woodham the poll is a warning light. 

She says 28% isn’t a death certificate, but it does indicate that National has a connection problem as well as a numbers problem.  

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