Previously, it was envisaged that the UKCA marking, at least on the packaging or accompanying document, would be mandatory by January 1, 2022. The application of the UKCA marking on the product is still scheduled for 01.01.2023.
The longer transition period is intended to provide support above all for products that require a conformity assessment with a notified body. There have been considerable delays in this regard to date.
Older information on this topic can be found here.
Further information can also be found on the website of the British government.