The UK and the EU have not yet started negotiations on the free trade agreement, so we cannot know for sure. Both sides said that under a future trade deal, the court would only settle disputes over EU law that could not be resolved by a joint committee. The Withdrawal Agreement provides for a transition period until 31 December 2020, during which the UK will remain in the Single Market to ensure smooth trade until a long-term relationship is agreed. If no agreement is reached by that date, the UK will leave the single market on 1 January 2021 without a trade agreement. A non-binding political declaration on the future relationship between the EU and the UK is closely linked to the Withdrawal Agreement. The agreement also provides for a transitional period until the 31st. December 2020 and can be extended once by mutual agreement. During the transition period, EU law will continue to apply to the UK (including participation in the European Economic Area, the Single Market and the Customs Union) and the UK will continue to contribute to the EU budget, but the UK will not be represented in EU decision-making bodies. The transition period will give businesses time to adjust to the new situation, and the UK and EU governments time to negotiate a new EU-UK trade deal.
  The UK has proposed an alternative model based on a form of arbitration involving both UK and EU representatives, as well as an independent element, as is the case in a number of other free trade agreements between the EU and third countries. This could be a possibility if the UK accepted a much less intense economic relationship at some point in the future, but that in itself would be a very complex and uncertain path – in particular, it would almost inevitably lead to a very significant restriction of the procedural and substantive rights of UK individuals and businesses. Under the Withdrawal Agreement, the CJEU no longer has general competence for the UK in relation to acts taking place from 1 January 2021. Whether he will play a role in overseeing future relationship agreements between the UK and the EU will depend on what is negotiated. Again, the difficulty of the situation is more political than legal – the UK economy faces a legal and economic abyss if the EU rights of UK nationals and businesses are abolished in one fell swoop in all 28 member states by the UK`s withdrawal on 29 March 2019. The UK is therefore trying to persuade other Member States to allow the UK to retain the economic benefits of EU law, not only in the UK (where the Withdrawal Act specifies the approach the government is referring to), but in all other Member States, including but not limited to Ireland and channel ports. On the Andrew Marr Show this weekend, Nigel Farage criticised Boris Johnson`s withdrawal agreement. This means, in particular, that in any future free trade agreement, the European Court of Justice will be the ultimate arbiter of disputes and will take binding decisions. .