The UK isn't part of EFTA (Switzerland, Norway, Iceland, +1 city state)CE markings are mandatory in EU and EFTA countries, which make up the EEA. All countries in Europe, bar some counties in Balkan, are part of the EEA.
The UK left the EEA on 31st December 2020.
European Economic Area - Wikipedia
en.wikipedia.org
European Free Trade Association - Wikipedia
en.wikipedia.org
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The UK's still accepting the CE markings. For some reason the UK's also talking about "UKCA" approval. Bluntly there's so much political bollocks resulting from brexit around this, it'll take a while to resolve.
As long as the CE and UKCA standards are identical, no problems. It's only if/when the standards diverge on certain goods that things get interesting. It's a fair bet that CE marking will be accepted for some time yet.
CE marking
How a product complies with EU safety, health and environmental requirements, and how to place a CE marking on your product.
www.gov.uk
What Brexit means for CE Marking
Continue reading to understand what Brexit means for CE marking & what will change regarding product compliance & requirements.
www.conformance.co.uk