Newshub has been leaked poll results from the company that does Labour's internal polling which show it is in big trouble, two-and-a-half months out from the election.

The results show Labour is on 26 percent support - crashing from 34 percent in May.

And New Zealand First, for the first time in three years of polling, is no longer the lowest rating party.

Winston Peters and co are on 14 percent - up 5 percent since May - just overtaking the Greens who are on 13 percent.

The company, UMR, does the polling for Labour's inner sanctum and the results are normally kept secret from the public.

Tonight the Labour Party and UMR said the results had not yet been released to the Labour Party and the leak must have come from a corporate client who had already been provided the results.

It is a credible, regular poll of 750 people that Labour's leadership and MPs really rely on - and the figures provided to Newshub are right up to date to July.

It is very unusual for this to be leaked - and the numbers look very bad for Labour.

The graph of greatest significance shows the party vote.

National is chugging along as usual - currently on 42 percent - then Labour (26 percent), the Greens (13 percent) and New Zealand First (14 percent).

But if you zoom in on the past six months, there's a fascinating trend.