On 16 September 2025, the UK
Health and Safety Executive (HSE) released the seventh edition of the Great
Britain (GB) Mandatory Classification and Labelling (MCL) list. This latest
update introduces new and revised mandatory classifications for 30 hazardous
substances, based on the fifth GB CLP Agency recommendation formally agreed by
Ministers in September 2025.
The changes were first notified
to the World Trade Organization (WTO) under reference G/TBT/N/GBR/101
on 7 April 2025, giving stakeholders the opportunity to review and comment on
the proposal.
Background on the GB MCL
The GB MCL list is a legally
binding register of classifications maintained by HSE under the GB CLP
Regulation. It provides a consistent framework for the classification and
labelling of substances and mixtures across Great Britain (England, Scotland,
and Wales). The list underpins regulatory obligations for manufacturers,
importers, downstream users, and distributors, ensuring accurate hazard
communication and supporting the protection of human health and the
environment.
The GB MCL is updated on a
regular basis to reflect scientific advances, regulatory decisions, and
international developments. Updates may involve the addition of new substances,
changes to existing classifications, and editorial improvements to ensure clarity
and accuracy.
Key Highlights of the 7th
Edition
Next Steps for Stakeholders
Stakeholders should review the
updated list and prepare for the transition period ahead of the 2028 compliance
deadline. The GB MCL list and the HSE GB CLP Publication Table here
provide detailed information on the updated entries, including the Agency
Opinions supporting each classification.