Information from the Gov.uk website on UKCA Marking advises of the following:
Selling goods in Great Britain
“The UKCA marking applies to most goods previously subject to the CE marking. It also applies to aerosol products that previously required the ‘reverse epsilon’ marking.
The technical requirements (‘essential requirements’) you must meet – and the conformity assessment processes and standards that can be used to demonstrate conformity – are largely the same as they were for the CE marking.
The circumstances in which you can use self-declaration of conformity for UKCA marking are the same as for CE marking. If you were able to self-declare conformity for the CE marking, you will be able to do the same for the UKCA marking.
You must use the UKCA marking from 1 January 2023. You can still use the CE marking until then.
The CE marking is only valid in Great Britain for areas where GB and EU rules remain the same. If the EU changes its rules and you CE mark your product on the basis of those new rules you will not be able to use the CE marking to sell in Great Britain, even before 31 December 2022.”