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Nigel Farage has admitted the call to divert an extra £350 million a week to the NHS was a big mistake.

The official Leave campaign's suggestion money saved from contributions to the European Union could be spent on the health service instead featured on buses, posters and was a key plank of their campaigning.

But the Ukip leader, who was not part of the Vote Leave campaign, would not guarantee the NHS would get the extra funds.

Asked on ITV's Good Morning Britain, he told Susanna Reid: "No, I can't and I would never have made that claim - it was one of the mistakes that the Leave campaign made."

Mr Farage went on: "It wasn't one of my adverts.

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"I think they made a mistake. They made a mistake in doing that.

"We have a £10 billion a year, £34 million a day featherbed - that is going to be free money that we can spend on the NHS, on schools, or whatever it is."

Slogans such as "We send the EU £350 million a week, let's fund our NHS instead" and "Let's give our NHS the £350 million the EU takes every week" were emblazoned on Vote Leave campaign material.

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And it raised eyebrows when it was plastered across the red Vote Leave bus as it had already been branded misleading.

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The figure has twice been described as misleading by the UK Statistics Authority watchdog because it referred only to the UK's £19 billion gross annual contribution and did not take into account Britain's rebate or money that comes back from the EU.

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When these factors are included, the net cost was around £7.1 billion a year - or £137 million a week.

On not being part of Vote Leave, he said: "You must understand I was ostracised by the official Leave campaign and did, as I have always done, did my own thing."

Mr Farage is not the only Brexit backer to be stepping back from some of the promises of the Leave campaign.

Conservative MEP Daniel Hannan is not making grand claims for immigration control.

He said: "All we are asking for is some control over roughly who comes in and roughly in what numbers."

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And pro- Brexit former defence secretary Liam Fox called for a "period of calm" and urged the Government not to invoke article 50 straight away while insisting Mr Cameron must stay on as PM.

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Dr Fox told BBC News: "A lot of things were said in advance of this referendum that we might want to think about again and that (invoking article 50) is one of them.

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"I think that it doesn't make any sense to trigger article 50 without having a period of reflection first, for the Cabinet to determine exactly what it is that we're going to be seeking and in what timescale.

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"And then you have to also consider what is happening with the French elections and the German elections next year and the implications that that might have for them.

"So a period of calm, a period of reflection, to let it all sink in and to work through what the actual technicalities are."