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These are the key events in the countdown to October 31, when the UK is due to leave the European Union with or without a deal.
September 3: MPs return to the House of Commons for first session after summer recess.
September 4: Chancellor Sajid Javid due to make Commons statement on government spending in 2020/21.
September 9: Parliament likely to begin process for prorogation.
September 10: Parliament likely to be prorogued until October 14.
September 14: Liberal Democrat party conference begins in Bournemouth. Jo Swinson likely to give speech on September 17.
September 21: Labour party conference begins in Brighton. Jeremy Corbyn likely to give speech on September 25.
September 29: Conservative party conference begins in Manchester. Boris Johnson likely to give speech on October 2.
October 14: State Opening of Parliament, including Queen’s Speech.
October 17/18: EU summit in Brussels.
October 21/22: Parliament likely to hold series of votes on Queen’s Speech.
October 31: UK due to leave EU.