The Ministerial decision, made with consent of the Devolved Governments (Scottish and Welsh Government Ministers), was adopted on 12 September 2025, published on 23 September 2025, and enters into force on 23 September 2025 (voluntary), 23 March 2027 (mandatory). The classification (Article 15 of the GB CLP Regulation) and labelling (Article 30 of the GB CLP Regulation) of the new/revised GB MCLs for the 30 substances should be reviewed and updated by duty holders without undue delay. Compliance with the amended 30 GB MCLs must be completed by 22 March 2027.