The UK has launched the formal process of withdrawal negotiations by formally announcing the European Council`s intention to leave the EU. In the United Kingdom, the system is much less stringent. A debate in Parliament is not necessary (although there is probably an agreement with the EU in practice) and, like the European Parliament, the British Parliament cannot make any changes. Decentralized executives and legislators do not formally have a say in ratification. After the second defeat of May`s divorce agreement, the European Council met in Brussels on 21 March to decide what to do next. EU leaders have given May two options: postpone Brexit until 22 May if MPs vote in favour of the withdrawal deal, or postpone it until 12 April if they vote against the deal. If the deal fails again in Parliament, May could ask for a lengthy extension. After an unprecedented vote on 4 December 2018, MEPs ruled that the UK government was not respecting Parliament because it refused to give Parliament full legal advice on the consequences of its proposed withdrawal terms.  The focus of the consultation was on the legal effect of the “backstop” agreement for Northern Ireland, the Republic of Ireland and the rest of the United Kingdom with regard to the CUSTOMS border between the EU and the United Kingdom and its impact on the Good Friday agreement that led to the end of the unrest in Northern Ireland, including whether , according to the proposals, the UK would be certain that it would be able to leave the EU in a practical sense. The procedure for ratifying the VA by the EU is defined in Article 50 of the Treaty on european Union. It is a two-step process.
The European Parliament must approve the agreement. The Council of the EU must then definitively approve the agreement by a qualified majority. The Council of the EU is made up of representatives of ministers from each member state. After years of political disagreement and drama, the British Parliament has adopted a comprehensive agreement to withdraw from the EU. Prime Minister Boris Johnson wants to sever all ties with the bloc, writes Barbara Wesel of the DW. (20.12.2019) Parliament must approve any future relations agreement. If such an agreement deals with powers that the EU shares with member states, national parliaments must also ratify it. On 20 December 2019, after the Conservatives won the 2019 British general election, the House of Commons passed second reading of the withdrawal agreement with a 358-234 lead. Following the amendments proposed by the House of Lords and the ping-pong between the two houses, the bill was granted royal approval on 23 January 2020, allowing ratification on the British side.
 If the UK and the EU agree on a future relationship agreement, the agreement will have to be ratified. What does that mean? Some international agreements also require enforcement provisions to transpose these obligations into national legislation.