To print this article, all you need is to be registered or login on Mondaq.com. 11pm (GMT) on 31 December 2020 marked the end of the Brexit transition/implementation period entered into following the UK's withdrawal from the EU. At this point in time (referred to in UK law as 'IP completion day'), key transitional arrangements came to an end and significant changes began to take effect across the UK's legal regime. For more details about IP completion day read our insight, what does IP completion day mean for the status of EU law in the UK? This article provides an introduction to retained EU law and an