21 September 2012 Last updated at 09:53
Mr Farage said the issue of Europe was resonating more with the UK public
UKIP leader Nigel Farage has demanded a "written in blood" guarantee of a referendum on EU membership before entering any pact with another party.
But he said any future "deal" with the Conservatives would be difficult, as he claims David Cameron opposes a "full, free and fair" vote.
He also insisted his party was not a "pressure group" and demanded action to simplify the tax system.
Mr Farage earlier addressed the party's conference in Birmingham.
He told the BBC that he has not "proposed a pact with anybody" and insisted the speculation was coming "from members of the Conservative party who are saying 'we must do a deal with UKIP'".
The UKIP leader said: "I'm making it absolutely clear that we would not do a deal under any circumstances unle
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