How to transfer your UK REACH registrations prior to the end of the transition period of the UK withdrawal from the EU | ECHA Guidance
As a registrant based in the UK, your REACH registrations and notifications will be void following the end of the transitional period of the UK’s withdrawal from the EU on 31 December 2020 at 24:00 hours CET (11 p.m. UK time). This document explains how you can transfer them to a company or only representative based in the EU-27, EEA or United Kingdom (Northern Ireland), that will manufacture in or import the substances into the EU/EEA/UK(NI) after the UK’s withdrawal. ‘The UK’ in this manual means the UK with respect to Great Britain, i.e. excluding Northern Ireland.