Why hasn't Davis assessed a cliff-edge Brexit?

MPs have warned the Government about the risks of the UK and EU failing to reach a trading agreement during Brexit negotiations. The cross-party Committee for Exiting the European Union has urged ministers to work out how much 'no deal' would cost - but some committee members weren't willing to support the report. Hilary Benn MP chairs the Committee - he told Share Radio's Alex Clark what his report set out to achieve.