The 15 August 2026 deadline for the sixth edition of the Great Britain Mandatory Classification and Labelling List has now passed, but it is not the end of the reclassification programme, only the first of several waves still working through the system. For smaller chemical suppliers without a dedicated regulatory team, keeping track of what comes next matters as much as clearing the deadline that has just gone.
This piece sets out what is still coming, and why smaller suppliers tend to feel the impact of each wave more than larger competitors do.
What Is Coming After the August Deadline
The seventh edition of the GB MCL List, covering 32 further substances, carries a compliance deadline of March 2027. A further 60 substances notified to the World Trade Organization in January 2026 are expected to reach mandatory compliance by the fourth quarter of 2028. Between the editions already in force and those still to land, well over a hundred substance entries are moving through the system over the next two years.
Why Smaller Suppliers Are More Exposed
A large manufacturer can assign a compliance team to track each edition against its full product range as it is published. A smaller supplier, often managing regulatory tracking alongside several other roles, is more likely to discover a relevant change only when a customer or an inspector raises it. That gap matters because the Health and Safety Executive has said enforcement pressure is rising, with covert online purchases used to check labelling accuracy without a supplier’s knowledge.
What Smaller Suppliers Should Do Now
Building a simple habit of checking each new MCL edition against a current product list, rather than waiting for a deadline to become urgent, is the most practical safeguard smaller suppliers have. Planning label reprints around scheduled artwork changes, rather than as emergency jobs once a classification has already changed, also keeps costs down considerably compared with a rushed reprint after the fact.
A short, recurring checklist works better than an annual audit for most small suppliers, since MCL editions are published on a rolling basis rather than a single fixed date each year. Checking the current substance list against a product range at the same time as routine safety data sheet reviews, rather than as a separate exercise, means the work gets done as part of an existing process instead of competing for attention as one more standalone task.
Suppliers exporting into Northern Ireland or the EU alongside the GB market have an additional layer to track, since those markets follow EU CLP rather than the GB MCL programme, meaning a single product can need two separate classification checks rather than one.