As a result of the UK leaving the European Union (Brexit), the UKCA mark (UK Conformity Assessed) will be phased in to replace the CE mark (European Conformity) for applicable goods to be placed in Great Britain (ie. England, Scotland and Wales.
See below a white paper produced by Exloc on the Subject:
Disclaimer: This guide is intended to give a general overview of the background, terms and processes relating to UKCA / UKEX. As individual products and the methods by which they are approved vary greatly, it is important to seek advice from an Approved Body and if applicable, obtain a quotation or price indication before making decisions about obtaining / applying the UKCA mark.