Nigel Farage announces his party's key election pledges As the Conservatives and Labour fight for victory, Britain's smaller political parties are set to play a key role in deciding who can form a government after the election as the main rivals struggle for a majority.The anti-EU United Kingdom Independence Party (UKIP) has offered to prop up the Conservatives in return for a referendum on leaving the European Union this year.Its leader Nigel Farage predicted it would win a double-digit number of seats as he launched a list of five campaign pledges Monday, although experts predict the figure will be closer to a handful. IMAGES AND SOUNDBITES.