By law, the United Kingdom is due to leave the European Union at the end of the Article 50 process, with or without a divorce agreement.
The scheduled departure date is now October 31, 2019, after leaders of the other 27 EU member states twice granted the UK an extension to the Brexit process. This followed a period of turmoil in the British parliament, which has repeatedly rejected an exit deal with the bloc.
The agreement, on the terms of the UK’s exit and outlining a framework for future ties, had been negotiated by London and Brussels and approved by the 27 other EU governments.
Although the delay has pushed back the immediate prospect of a "no deal" Brexit, such a scenario could return. British politics remain deadlocked over the path ahead; attitudes within the ruling Conservative Party have hardened against the deal on offer but remain committed to leaving the EU; meanwhile in Europe, there has been growing reluctance to let the UK's Brexit paralysis drag on.
A UK exit from the EU with no deal on the terms would hit more than trade: legal arrangements covering many aspects of everyday life would abruptly cease to apply.
Preparations for a no-deal scenario have intensified – as have business warnings of damaging consequences, dismissed as scare stories by some Brexit supporters.
Euronews has examined in detail how the rules would change under no-deal, and how this might affect the UK and the EU. Articles are clickable in the sections below.
Our explainer on trade looks at the potential impact of WTO rules and warnings of disruption to the economy on both sides of the English Channel.
We examine how EU citizens living in the UK and British nationals on the continent would be affected by a no-deal Brexit.
Travel and consumer issues
What no-deal would mean for travellers and consumers, covering issues such as passports and visas, health cover, driving, roaming charges, and cross-border legal cases.
The Irish border
Ireland insists the new EU-UK land border will remain open even under no deal, though the EU will want to protect its single market. Our overall Brexit Guide explains the controversial backstop proposal, while other explainers look at the historical context, and possible technological solutions and other alternative arrangements for the border.
The European Commission’s Contingency Action Plan for Brexit lays out basic plans in a no-deal scenario to regulate citizens’ rights, financial services, air transport, road haulage, customs and exports, and climate policy.
It does not cover issues such as cooperation on security, crime and terrorism. However, a British government paper makes it clear that the UK would no longer have a formal relationship with Europol, and would no longer be part of existing systems on data-sharing, extradition, and co-operating to fight money-laundering and terrorist financing. The UK's security minister has warned that both sides would be put at greater risk.
For scientific research, the British government has guaranteed funding for UK competitive bids for EU projects submitted before Brexit. But there is uncertainty over future partnerships beyond Horizon 2020, the EU research and innovation programme, when it ends next year. The government says it wants talks with the EU to ensure the UK can continue taking part in programmes as a third country.
The UK government has also published a series of papers giving advice on the consequences of no-deal and how to prepare. It confirms that there would be no agreement on applying arrangements set out in the exit deal.