On 29 March 2017, the United Kingdom notified the European Council of its intention to leave the European Union. Unless a ratified withdrawal agreement establishes another date or the European Council, in accordance with Article 50(3) of the Treaty on European Union and in agreement with the United Kingdom, unanimously decides that the Treaties cease to apply at a later date, all Union primary and secondary law will cease to apply to the United Kingdom from 30 March 2019, 00:00h (CET) ('the withdrawal date'). The United Kingdom will then become a third country. These notices, which aim at preparing citizens and stakeholders for the withdrawal of the United Kingdom, set out the consequences in a range of policy areas.
In addition, EU decentralised agencies have published information in relation to the UK's withdrawal from the EU, for example the Community Plant Variety Office, the European Chemicals Agency, the European Medicines Agency and the European Union Intellectual Property Office. Furthermore, the three European Supervisory Authorities (the European Banking Authority, the European Securities and Markets Authority and the European Insurance and Occupational Pensions Authority) and the Single Supervisory Mechanism have issued opinions and guidance.