On 10 September 2018, the House of Commons Library published a 172 page briefing paper on what could happen if the EU and UK negotiators do not agree a withdrawal agreement in time and the UK has to leave the EU on 29 March 2019 without one and with no framework for future relations.

The paper examines how such a situation might come about, the constitutional implications for the UK and the devolved administrations, and what the impact might be in a range of policy areas, including financial services.