It is a Brexit thing. UK companies can no longer use the CE mark, hence the UKCA mark. So a slip of paper needs to be included if the product is likely to get sold in the UK.
"The UKCA (UK Conformity Assessed) marking is a new UK product marking that is used for goods being placed on the market in Great Britain (England, Wales and Scotland). It covers most goods which previously required the CE marking."
www.gov.ukIf you wonder why the Northern Ireland part of the UK is not included, you have found the crux of why Brexit took so long to bring about. That and fish.
