Draft Withdrawal Agreement does not guarantee frictionless free flow of personal data from EU
The draft Withdrawal Agreement at Article 71(2) implies an adequacy assessment by the European Commission could happen in future (this is expected before the end of the transition period in December 2019), but first the UK has to leave the EU and then the Commission has to follow the rules in Article 45 of the GDPR.
This means that the Commission has to involve the European Data Protection Board (EDPB) as part of the adequacy determination process so it won’t be a quick process. However, UK may not get an assessment of adequacy at all.
Full article: Draft Withdrawal Agreement does not guarantee frictionless free flow of personal data from European Union