Another almost full page about the slogan on the side of a bus, and still no-one can show that any of those campaigning for leave intended that this was a promise of what the country would do with 350 million a week post Brexit.

Also:
From: Dave the Gnome

Neither Nigel has adequately explained why Farage was not true to his word when he said there should be a second referendum if the leave vote was not more than 2/3rds.

There could be unstoppable demand for a re-run of the EU referendum if Remain wins by a narrow margin on 23 June, UKIP leader Nigel Farage has said.
...
The question of a second referendum was raised by Mr Farage in an interview with the Mirror in which he said: "In a 52-48 referendum this would be unfinished business by a long way. If the Remain campaign win two-thirds to one-third that ends it." (BBC News 17 May 2016)

Of course it could be explained by the fact that he is a lying manipulative little shit.

While I have no real insight into the workings of Nigel Farage's mind, I can suggest that he might have meant that a close run result (in favour of 'Remain') would be open to challenge because of the use of public money to fund the one-sided propaganda issued by the remain side.
He then went on that this would only be a realistic challenge if the vote was close. A 2/3 majority (of those voting, and in favour of Remain) would have settled the matter.

As it was, the Brexit team won the referendum with a slender majority (of those voting) despite attempts to use public funds to weight the vote.

Recent moves to tax donors to only one side of the referendum show just how ingrained this weighting of the vote is.