ECHA's Guidance on Labelling and Packaging
Where to Find ECHA's Guidance
You can view the full document from the ECHA here.
"From 1 January 2021, the classification, labelling, and packaging of chemicals placed on the market in Great Britain (England, Scotland, and Wales) is regulated by the ‘Retained CLP Regulation (EU) No. 1272/2008 as amended for Great Britain’, known as GB CLP."