National leader Bill English says he is disturbed a burst fuel pipeline has disrupted people's travel plans but he remains confident the situation will be rectified as soon as possible.

English said Air New Zealand had told him they were doing absolutely everything they could to accommodate disrupted passengers.

He made the comment to Newstalk ZB's Mike Hosking during the leaders' breakfast interview this morning.

English said the cost of installing a second pipeline would have had to be passed on to consumers so one had not been put in. It was the first time there had been a disruption to the supply.

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He said another option was to increase storage at the airport so there were greater reserves.

English was also asked about Pike River and said he expected an unmanned re-entry into the mine by the end of the year.

"It will help them answer more questions, they want those answers and we've committed $5 million or so to help them get them."

On the Morrinsville farmers' rally today, English said the way some politicians had used the water situation had been "divisive" and farmers were aware of their responsibilities.

"Whatever divisiveness is there from this campaign I think will be fixed pretty quickly if we get on with the job."

National Party leader Bill English today faces a grilling from Mike Hosking in the second and last of the Newstalk ZB Leaders' Breakfasts.

English said he was enjoying the election campaign more than he'd expected and the level of public interest was higher than he'd seen in some time.

Household incomes were the main issue people raised with him on the campaign trail.

Asked by Hosking whether there was any point to the campaign rituals of walkabouts and selfies with people he'd probably rather not have to meet with, English hit back:

"I'm not sure how you feel about your listeners, but my voters, they're precious."

English said it ensured parties honed down their messages to voters.

"In this election it's got a whole lot of the public interested who probably haven't been interested in a while."

English was also grilled by Hosking on revelations last week that former Foreign Affairs Minister Murray McCully and his ministry had not received legal advice over the Saudi sheep deal.

English said the belief that New Zealand could have been sued by Saudi Arabia had prompted it to give an "agrihub" to a Saudi Arabian businessmen was based on McCully's "view".

McCully had said he went ahead with the agrihub to thwart potential legal action over New Zealand's ban on live sheep imports on the basis of legal advice.

It has since transpired there was no such legal advice. English defended McCully, saying he was entitled to reach such as conclusion as a minister.

"It's his view. He's entitled to take a view."

When questioned about unemployment English said he did not accept that there was a group of people in New Zealand who were just not willing or motivated to work, saying if those people were supported enough they could get jobs and stick to them.

He pointed to National's plan for more support but harsher sanctions for the young unemployed who either did not take up training or work opportunities or failed drug tests.

"Some of them are just cycling in the system, turning up and not going back.

"They can get in the door but they don't always turn up. If you can get them to stick for 12 months, then they'll stick in the job."

Asked about the difficulties some businesses were having in finding enough good staff, English said that was because the economy was working.

"It creates more jobs - we've got a higher proportion of our working population in work than before."

English also rejected comments by some business heads during the Herald's Mood of the Boardroom event that National was complacent and had missed opportunities, saying those were made by a few businesses who had been doing very well.

"One of those did let me know that when they went in to the ballot box, he voted National."

As an ad break began, Labour leader Jacinda Ardern's voice boomed out of the speakers as a Labour ad began - English laughed and pretended to wave at her.

During Ardern's own Leader's Breakfast last Monday, a National Party ad played.

English says Labour's proposal to renegotiate the Korean free trade agreement is a "crazy idea" and will ruin New Zealand's credibility.

"You would blow your credibility if you went back for a single domestic point. Because we are a small country with not much to offer them but who are always asking for things, we rely on our credibility."

Ardern has said she wants to renegotiate the recently signed agreement to allow for Labour's policy to ban foreigners buying property in New Zealand. Ardern believed South Korea would accept that given it had a similar protection for itself.

English expected South Korea would dismiss the idea given New Zealand had nothing to give back in return.

"They would say we are holding out against President Trump and the US which also wants to renegotiate its trade agreement with South Korea, and they would say bye bye."

Asked if he was embarrassed about the amount of money being splashed around in promises on the campaign trail, English said no - it was business as usual.

"What you are seeing here is two things - this has always been a busy Government, that's how you see projects like Waterview being completed ahead of time.

"The other aspect was that some of it was just people paying more attention to what the Government was doing. It had spent billions fixing schools over the last few years."

It was also important to set out what the government was doing.

English said he was "confident" National would be the highest polling party on election night, but would not be drawn on who he might form a government with.

He said that was up to the voters. He would not predict whether the Green Party would make it back.

Asked about Special Housing Areas, he said those were coming on track since the Auckland Unitary Plan came into effect.

He could not say how many of the Special Housing Areas had actually been built, but more than 200,000 houses would be built in New Zealand over the next few years.

"There are 10,000 [houses] being built in Auckland as we speak and the construction sector is running as fast as it can."

He said the Government had taken as much responsibility as it could. "People want to aspire to owning their own home, we've just beefed up Home Start and 30,000 people have already used that."

He denied the Government was creating artificial mechanisms to get first home buyers into a home.

He said National believed it needed to change urban planning to ensure that when demand grew the houses could be delivered. It has proposed a different set of rules which would apply in cities rather than the Resource Management Act.

"We need a framework for urban planning that is designed for that purpose." He said the RMA was designed for environmental impact rather than urban areas - and that had led to situations such as housing in Christchurch being built on swamps.

Asked if it was now unrealistic for families to expect a three-bedroom house in the suburbs rather than a flat, English said that was already happening in areas such as Hobsonville Point where there was strong demand for terraced, medium-density housing.

Asked whether National was now trying to play catch-up on social issues after nine years, English said it had the time and energy to dedicate to those issues.

He said there were now 60,000 fewer children in benefit-dependent households.

"You know why? Because their parents got jobs in a growing economy."

English would not say whether he would stay or resign if Election Day did not deliver a win. "I'll deal with that on the night, I'm committed to politics, I'm committed to the National Party and I'm going for the win."

In a series of quick fire questions, he was asked what he admired about Jacinda Ardern:

"She stepped up to a tough job but I think it's become apparent she doesn't have the team behind her to follow through on what are some very high expectations."

On Winston Peters, he hummed and ha-ed before settling on: 'Well, I suppose stamina."

The world leader he admired most was German Chancellor Angela Merkel, who he met on a visit to Europe earlier this year.

"Just a calm considered person whose judgement is trusted by Europe."

He said Germany had an election the same day as New Zealand - and Hosking pointed out Merkel also had a 13-point lead in the polls. English laughed and said you never knew what changes there could be in a week.