Stephen Sackur speaks to John McDonnell, Labour's shadow chancellor. On the 29th of March 2019 Britain is scheduled to leave the European Union. That beguilingly simple statement is at the heart of a political crisis which deepens by the day. The ruling Conservative party is riven with splits, so too is the Labour opposition. If Parliament's Brexit paralysis persists then Britain will leave with no deal in place, no orderly transition, and the prospect of economic disruption. What will Labour do in this moment of political truth? Show less