The candidate list is a list of substances of very high concern (SVHC) that can be prioritised for inclusion on the authorisation list. Once a substance is added to the authorisation list, it may not be used after the specified ‘sunset date’ unless the Secretary of State has granted a business-specific authorisation for that use.
When UK REACH came into force, all substances that were on the EU REACH candidate list were carried over onto the UK REACH candidate list. The UK REACH work programme for 2021-22 committed to assess those substances that have been added to the EU REACH candidate list since UK REACH came into force, to consider if it was appropriate to add them to the UK REACH candidate list.
Source: Defra.