Vince Cable: Liberal Democrats must be voice of sanity – video

Business secretary Vince Cable says the Liberal Democrats must be the voice of reason in British politics and stand up to the 'purveyors of panic, prejudice and pessimism'. Speaking at the Lib Dems' party conference in Glasgow, Cable derides the Conservatives as 'Ukip without the beer', and Labour as 'French socialism without the sex'. He also discusses the benefits of immigration