UKIP's Farage warns Britain: Brace for a second election in 2015

By Andrew Osborn LONDON (Reuters) - Prime Minister David Cameron is likely to win a May 7 national election and form a minority government, but his grip on power could be so tenuous that Britain will hold a second ballot this year, the leader of the UK Independence Party (UKIP) warned. Opinion polls indicate neither Cameron's Conservatives nor the opposition Labour Party will win an overall majority in the 650-seat parliament as millions of voters turn to Farage's anti-EU UKIP party an