Prime Minister John Key has visited Northland for the second time in less than a week in the lead up to the region's by-election this month.

Source: Breakfast

And while National's Northland candidate, Mark Osborne, has been eager to capitalise on the appearances, Winston Peters wasn't pleased today.

"We are the underdogs because if you look at their hoardings I'm up against two candidates," Mr Peters said.

"John Key and somebody that nobody knows about."

Mr Key insisted today the visits were already planned.

It's looking increasingly likely Act leader David Seymour will tell his party's supporters to vote for Mr Osborne, and not Act candidate Robin Grieve, in an effort to stop Mr Peters snatching another seat. Labour leader Andrew Little last week subtly hinted at his supporters to vote for Mr Peters.

Meanwhile, Communications Minister Amy Adams today announced in Kerikeri while campaigning with Mr Key and Mr Osborne, the Government will committ up to $210 more to extend ultra fast broadband to 80% of the country, adding that Northland towns like Kerikeri, Kaitaia and Kaikohe are strong contenders for inclusion.

She says the announcement has nothing to do with the by-election, "we announced it last year and we've been working on it since", she said.

But Mr Peters disagrees.