File photo dated 3/5/13 of a UKIP candidate's rosette. The UK Independence Party will fail to achieve its electoral potential because leader Nigel Farage refuses to loosen his grip on power, its ... more 
File photo dated 3/5/13 of a UKIP candidate's rosette. The UK Independence Party will fail to achieve its electoral potential because leader Nigel Farage refuses to loosen his grip on power, its former chief executive has said. less 
1 / 27
Press Association Images
Wed, Aug 21, 2013 6:15 AM EDT