Nigel Farage last night boasted that his supporters will 'buy one get one free' when the Brexit Party's success tomorrow ends the leadership of Theresa May and Jeremy Corbyn.

Speaking to a crowd of about 3,000 at Kensington Olympia, west London, Mr Farage said both leaders would face the axe after the European elections.

Mr Farage also called Mrs May's premiership a 'slow-motion betrayal' and said she had dragged the country through a 'constant abject humiliation'.

Brexit Party leader Nigel Farage speaks during a Brexit Party campaign event in London today

The final Brexit party rally ahead of the European elections was attended by 3,000 supporters

He said: 'Not only will we get rid of Mrs May, but – with the way we are smashing Labour in Wales – a big Brexit Party win will mean getting rid of Jeremy Corbyn as well.

'This is now about more than leaving the EU and is now a fundamental question about democracy.

'Mrs May's constant abject surrender to the bully boys in Brussels has turned into a constant abject humiliation and I have had enough of it.'

Every mention of the Conservative Party, including Boris Johnson, was met with resounding boos.

Calls of 'traitor' and 'humiliation' rang out across the hall whenever the Prime Minister's name was mentioned. There were Trump-esque call-and-response segments throughout, with a mainly elderly crowd chanting 'Nigel! Nigel!'

People queue outside Kensington Olympia in London ahead of Brexit Party leader Nigel Farage's European Election Rally

Brexit Party leader Nigel Farage holds up a placard at today's Brexit Party campaign event in London

When party chairman Richard Tice called, 'What do we want?' the crowd would shout 'Brexit'.

Supporters queued for more than two hours as they waited for Mr Farage to appear, waving blue flags.

Mr Farage came on stage to soft rock and the crowd rose to their feet, holding their phones aloft.

Around 3,000 paid £2.50 to see him, and many raised their hands when Mr Farage asked if they paid the £25 supporters fee. 'This', said Mr Farage, 'is where our money comes from' – a reference to last week's allegations over the party's funding.

Last night Mr Farage said he would 'not even mention the yobbo' who attacked him with a milkshake on Monday. The incident was described by Mr Tice as 'a grave attack on Nigel and his family.' Mr Farage has said it was a symptom of the 'radicalisation' of Remainers in the EU.

Farage boasted that his supporters will 'buy one get one free' when the Brexit Party's success tomorrow ends the leadership of Theresa May and Jeremy Corbyn

Mr Farage came on stage to soft rock and the crowd rose to their feet, holding their phones aloft

He said they classed themselves as an elite who believed they were 'morally superior' to Brexit voters.

Meanwhile, in an article for The Daily Telegraph, Mr Farage wrote: 'Talk from respected figures has stoked hostility and anger in our politics. It has helped to legitimise the radicalism of militant Remainers who do not hide their contempt for the demos – the people – and imagine that they can stop the march of a mass movement with a milkshake.'

Mr Farage was joined on stage last night by former Tory Party grandee Ann Widdecombe, who is standing as an MEP.

Miss Widdecombe warned the support for the Brexit Party would not end on Thursday. She said: 'Either let Britain leave the EU or we'll make sure you leave Westminster.

'Thursday is not the end. It's the beginning of bringing true democracy back to this country.'

Calls of 'traitor' and 'humiliation' rang out across the hall whenever the Prime Minister's name was mentioned at the rally

Mr Farage was joined on stage last night by former Tory Party grandee Ann Widdecombe, who is standing as an MEP

Activists hold up Brexit Party placards ahead of an address by Farage ahead of the European elections

She also joked about the spoilt ballots at the local elections, saying: 'We weren't even around for the local elections but people were already writing our names on the ballot paper.'

She was joined by guest speaker Vaclav Klaus, the former Czech president and a lifelong Eurosceptic.

Calling the audience his 'Brexit friends', Mr Klaus said the referendum result had given great hope to many in his country. He said: 'In the moment we first heard the referendum result in the Czech Republic, you could hear the opening of champagne bottles.'

Mr Klaus, who served as president until March 2013, had his leadership marred by controversies. In 2007, he said: 'Environmentalism should belong on the social sciences, along with other 'isms' such as communism, feminism and liberalism.'

He went on to say that global warming was 'a communist conspiracy'.

A YouGov poll from yesterday saw the Brexit Party second place in London, three percentage points behind the Liberal Democrats.

The Lib Dems were on 24 per cent, with the Brexit party on 21. Labour were on 19 per cent and the Conservatives were on ten.