Boris Johnson has suffered another defeat in the Commons after MPs voted by 322 to 306 for the backbench Letwin amendment to withhold approval for the PMs Brexit plans until relevant legislation has passed. The move compels Johnson to request another extension from the EU which he appeared to rule out when speaking in parliament.. Meanwhile, an estimated one million people marched on Parliament Square to demand a second referendum  No delays, vows Johnson after humiliating Commons defeat What does the Letwin amendment mean for Brexit timetable? March organisers hail ‘one of the greatest protest marches in British history’