Labour MPs started singing revolutionary anthem The Red Flag after Scottish and Welsh nationalists sang Flower Of Scotland and Bread Of Heaven.

The extraordinary scenes erupted as the Commons session was closed down shortly before 2am by the prorogation order, recommended to the Queen by the Prime Minister, in an act most MPs believe was intended to prevent Parliament having a say over Brexit. Minutes earlier, Mr Johnson suffered his sixth Commons defeat when MPs failed to back his call for a snap general election.