There has been a strong showing for National in the last 1 NEWS Colmar Brunton opinion poll of the year, with the party climbing two percentage points in our November Poll to 50 per cent.

The poll, taken in part after the Kaikoura earthquake, also shows Labour making some ground, up two points to 28 per cent.

However its centre left partner the Greens have slipped back to two per cent this poll to 11 per cent. That gives the Labour-Green block 39 per cent in total.

New Zealand First is back one per cent to 10 per cent, while the Maori Party's support has slipped from two to one per cent.

In the preferred Prime Minister stakes John Key has taken a hit, down two percent to 36 per cent.

That continues a slight downward trend in recent polls and puts him at levels not seen since late 2008.

However Labour leader Andrew Little is also down this poll from 10 per cent to eight per cent.

That's equal with Winston Peters who is down three points.