Nigel Farage emerged on top after TV debate with Nick Clegg which saw them brand each other liars and fantasists, according to a poll.
Airbus director Andy Stroomer says leaving the EU would mean the UK would lose out on 'opportunity'.
Ed Miliband effectively ruled out a referendum on Britain's membership of the EU today, as he set out his party's stance on the issue.
The Government has announced that European Union migrants will have to wait at least three months before they can claim child welfare payments.
From July 1, migrants will need to prove they have been in Britain for three months in order to claim child benefit and child tax credit.
Ministers claim the move is to stop the welfare system being open to abuse.
There is already in place a three month wait for migrants before they can claim jobseeker's allowance.
ITV News' Political Editor Tom Bradby, Deputy Political Editor Chris Ship and Political Correspondent Carl Dinnen have given tweeted their thoughts on the second debate on Europe between Nick Clegg and Nigel Farage:
I am struggling to think of something sensible to say about that. Nigel did better, but his support of Putin is weird. Nick shouted more.
I thought Nick edged it last week (against popular opinion among colleagues) This week was Farage's night (more clearly so too)
The polls give Nigel Farage a bigger win than last week - but will the LDs get more votes out of these debates than they would otherwise?
A YouGov poll for the Sun newspaper found that 68% people thought Nigel Farage won tonight's debate.
An ICM poll for the Guardian newspaper found that 69% people thought Nigel Farage won tonight's debate.
Guardian news editor Dan Sabbagh tweeted:
ICM/Guardian poll: Farage 69% Clegg 31% http://t.co/Nr2r12x3bP
The exact question posed was:
Putting aside your own party preference and only basing your answer on what you saw or heard during the debate, as far as you are concerned which one of the two leaders do you think won the debate?
Well, so far, they've swapped roles; Nick is shouty and Nigel is more measured. And I'd say Nigel is consequently getting the better of it.
Nigel Farage told the EU debate: "Immigration has left our white working class as an underclass."
Farage talking about the white working class left behind ... careful now. #europedebate
Nick Clegg and Nigel Farage have clashed over British foreign policy regarding Ukraine, Russia and Syria.
Farage turns Putin problem into UK not getting involved in foreign adventures. #europedebate
Mr Farage also attempted to clarify comments he made about Russian president Vladimir Putin, saying he admired him "as an operator" but not as a man.
Farage on Putin; I don't like the man... #europedebate
In an interview with BBC News, Ukip leader Nigel Farage said it was "more than likely" that it was Syrian rebels, not pro-Assad forces, responsible for chemical attacks in the country.
Asked about comments he made recently in support of Russian president Vladimir Putin, Mr Farage said:
We were about to go to war in Syria because poison gas - sarin gas - had been used, and everybody in London and Washington and Brussels assumed it had been used by Assad.
And Putin said, 'Hang on a second, don't be so sure.'
It turns out it's more than likely it was the rebels that used the gas.
If Putin hadn't intervened, we would now be at war in Syria.
United Nations human rights investigators said that evidence suggested that those responsible for March 2013 attacks in Damascus "likely had access to the chemicals weapons stockpile of the Syrian military."
Lib Dem leader Nick Clegg and Ukip's Nigel Farage go head-to-head for the second time tonight in a televised debate on the UK's membership in Europe.
Polls suggested Farage "beat" the Deputy Prime Minister during the first clash last week, which included debating immigration figures and the number of laws from Brussels.
But Mr Farage was criticised over recent days after he named Russian President Vladimir Putin as the world leader he admires most.
Ukip membership is said to have surged over 25,000 in last Wednesday's LBC Radio-hosted debate last Wednesday.