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United Future leader Peter Dunne had his blood pressure taken yesterday but says he could not be more relaxed about his decision to rule out working with Labour after the election.

United Future president and local candidate Denise Krum set up a table outside Onehunga Mall in Auckland offering free blood pressure tests under a chart showing Labour's pressure was too low, National's was too high, but her party was comfortably in the centre.

"The point it's trying to make is if you look at political pressure then clearly the purple bit in the middle, the United Future bit, is the most stable, reliable and good for us all," Mr Dunne said.

"It's slightly higher than normal, but I think that's the pressures of the campaign."