United Kingdom Independence Party (UKIP) supporters take part in a demonstration outside the Houses of Parliament in central London on October 24, 2011, the day that Parliament votes on whether to hold a referendum on the UK's membership of the European Union. David Cameron faced the biggest rebellion of his premiership today as eurosceptic backbenchers in his Conservative Party vowed to defy orders and vote for a referendum on Britain's EU membership. AFP PHOTO/ CARL COURT (Photo credit should read CARL COURT/AFP/Getty Images)
