Well-known Northland doctor Lance O'Sullivan, who earlier reprimanded Kaitaia locals for breaching alert level 4 lockdown, has admitted a breach of his own.

In a video O'Sullivan uploaded to Facebook, he repeatedly calls himself a "dick" for going kayaking over the weekend.

"We've been living in a campervan doing our work for the Kaitaia community, but on the weekend I went for a kayak to a place not far from the place I'm staying," he said.

"I'm a dick and I f...ed up. F..., what a silly bugger, eh? A silly b......."

MONIQUE FORD/STUFF Dr Lance O'Sullivan, who earlier criticised others for breaching lockdown rules, has admitted he did so himself.

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Kayaking, like most other water-based activities, is not permitted at alert level 4 because there is an increased risk of coronavirus being spread if participants require search-and-rescue services.

In the video, O'Sullivan - who was chosen New Zealander of the year in 2014 - acknowledges the irony of breaching lockdown just two weeks after calling others out on social media.

O'Sullivan earlier filmed himself in the main street of Kaitaia, Northland, showing how many cars were on the roads.

He labelled the lockdown in Kaitaia a "joke" and urged everyone to stay home.

While O'Sullivan admitted he had been a hypocrite, he said we would continue to call out problems in the community when he saw them.

"To be fair, I'm human - I've made many, many mistakes in my life and I'll make many, many more. Should that stop me from standing up and saying when I see things that are wrong? No," he said.

"I'll keep doing it, and when I make mistakes, I'll tell you."

On Wednesday, there were six new cases of Covid-19 and one death announced.

The death was of a woman in her 80s who had been linked to the Rosewood rest home cluster in Christchurch. New Zealand's death toll is now at 14.