Keith Fraser, who is standing in Hackney North and Stoke Newington, said British teenagers who want to join ISIS should be given free seats on flights

British teenagers who want to join ISIS should be given free seats on flights to Iraq and Syria, a Ukip candidate has said.

Keith Fraser, who is standing in Hackney North and Stoke Newington, said money should be spent on chartering planes rather than trying to stop them fighting with extremists.

Around 600 Britons are believed to have fled to Syria including a group of three schoolgirls from east London.

Mr Fraser said: ‘We have many young people wanting to join up with their “brothers” in IS. Let them bloody well go.

‘Why are we concerned in wasting our time and resources in assuring these people don’t go to join?

‘Instead let’s find out who wants to go and we can then spend public money in chartering our own planes to take them there. We don’t need these traitors in our beloved country.

‘They can hand over their British passports on the way out and say don’t ever try and come back.’

The Ukip candidate, who currently works as a chartered surveyor, said that the extremists ‘have one aim to convert or murder all “non-believers”.’

He added: ‘They don’t like our freedom, want to destroy our way of life and will not rest until they fly their flag over our shores.’

Mr Fraser’s comments came as Nigel Farage revealed the party’s pledge card, which includes saying no to the EU, controlling the country's borders, an extra £3 billion for the NHS, cuts in foreign aid spending and no tax on the minimum wage.

At the launch in Westminster, the Ukip leader said it is now ‘a party of what modern Britain is’.

He said: ‘The thing about Ukip is we have become the most eclectic, diverse political party.

‘We've got all shades of opinion, we've got people from the left, people from the right, people of all ages, all classes, all races.’

Although the posters include a pledge to control the UK's borders, the word ‘immigration’ does not feature.

Around 600 Britons are believed to have fled to Syria including a group of three schoolgirls from east London

The leader was joined by Ukip MP Mark Reckless and other senior Ukip figures, but Clacton MP Douglas Carswell did not attend the event as he was campaigning in his constituency.

Mr Farage said a strong showing for Ukip at May's election could boost the calls for electoral reform, which in turn could make his eurosceptics a ‘big party in British politics’.

He said: ‘I've always thought there should be election reform but that is frankly irrelevant in the next 38 days.

‘Yes, this is very hard for us because you find good Ukip support in Labour constituencies and in Conservative constituencies.

‘Yes, that's a challenge but what we have to do is to get over the line in enough seats in this General Election campaign and then you'll see how many seats we've actually come second in, and you'll realise as part of a longer-term strategy this really could become a big party in British politics.’

Mr Fraser’s comments came as Nigel Farage revealed the party’s pledge card, which includes pledges on the EU, immigration, extra spending on the NHS, cuts in foreign aid spending and no tax on the minimum wage

At the launch of the party's pledge card in Westminster, the Ukip leader was joined by Ukip MP Mark Reckless and other senior Ukip figures, but Clacton MP Douglas Carswell did not attend the event

On his quest to become an MP in South Thanet, Mr Farage said he was facing a ‘hell of a fight’.

He said: ‘There are easier seats I could have gone for. I am confident but certainly not complacent.’

Asked if his party could get into double figures for seats, he replied: ‘Of course we can.’