Key and National lead latest opinion poll

John Key. Photo / Greg Bowker

The National Party is well ahead, as is Prime Minister John Key in the latest opinion poll.

The 3 News Reid Research Poll has National on just under 50 per cent support, a clear 20 points ahead of Labour which is polling just below 30 per cent.

The Greens are on just over 14 per cent and all other parties in parliament are well below the five per cent MMP threshold.

John Key has a commanding lead in the preferred Prime Minister stakes with 44 per cent support, compared with Labour leader David Shearer's 10 per cent.