Labour leader Ed Miliband is the top target of the UK Independence Party in this year's British general election because of his refusal to back a referendum on leaving the European Union, UKIP leader Nigel Farage said on Tuesday (February 3).

Speaking at the Reuters Euro Zone Summit in Brussels, Farage branded the opposition chief "a high priest of the European dream" and said his refusal to let voters decide on Britain's future in the EU was "hurting him horrendously", notably in working-class areas of northern England.

UKIP thinks it can take a large chunk of disenchanted Labour voters, leaving Prime Minister David Cameron's Conservatives as the biggest party but well short of an overall majority and needing the support of one or even two other parties to govern.

"I think we have bitten a very large chunk out of the Conservative vote, and that doesn't mean in certain constituencies we can't bite a lot more. If Tory voters in some constituencies see us as potential winners, we can bite a lot more. But across the country we are probably not going to take a big chunk more of Conservative voters, but we can take a big chunk more of Labour voters. So, yes, he is our chief adversary," said Farage.

But Farage was cautious when asked whether his party could end up as kingmaker after the general election, which polls show is the most uncertain for a generation.

"UKIP's going to win seats, of course we're going to win more than a handful. Beyond that I just don't know," he said.

The populist former commodities trader, who likes to be photographed with a cigarette and a pint of beer, said Greek electors had shown they were willing to challenge the European status quo, setting an example for others.

Greece would be better off leaving the euro zone and rebuilding its competitiveness with a devaluation, he said.