UK15 Notices Explained: What Suppliers Need to Know About Dynamic Market Modification Notices

What is a Dynamic Market Modification Notice?

A UK15 notice, formally a ‘Dynamic Market Modification Notice’ under section 39(4) of the Procurement Act 2023, must be published as soon as reasonably practicable after a contracting authority modifies a Dynamic Market that’s already established.

Regulation 25(6) sets out what it must contain. Importantly, the Act does not allow conditions for membership to be modified during the life of a Dynamic Market – that bar is fixed at establishment to ensure fairness to every supplier, whenever they apply. What a UK15 does cover is:

• The date from which the modification takes effect
• Where the list of suppliers on the market is being amended, details of any supplier being added or removed
• A summary explaining any other modifications – sufficiently detailed for interested parties to understand the nature and scope of the change, for example the addition of a new part to the market or new specifications for goods that can be procured under it.

When are Dynamic Market Modification Notices Published?

UK15 notices are published reactively, whenever a contracting authority makes a change to an existing Dynamic Market.

• Triggered by change, not a schedule: A UK15 appears whenever the authority adds or removes a supplier, or otherwise modifies the market’s scope.
• Can happen more than once: A single Dynamic Market may be modified multiple times over its life – for example, as new suppliers join or new parts are added – so it’s worth checking for more than one UK15 against any market you’re monitoring.

How can Suppliers use Dynamic Market Modification Notices?

Modification notices are the best way to track how a Dynamic Market’s membership and scope evolve after it’s been set up.

• Watch for new parts or specifications: If a market adds a new part, or new specifications for what can be procured under it, that may open up opportunities that weren’t there when the market was established.
• Track the current supplier list: Additions and removals are recorded here, so it’s a reliable way to see who’s currently active on a market you’re interested in.
• You won’t need to requalify because of a conditions change: Since conditions for membership can’t be altered during the market’s life, a UK15 will never require existing or prospective members to meet a new or different bar.

Why are Dynamic Market Modification Notices used?

UK15 notices exist to keep the public record of a Dynamic Market accurate and current throughout its life, not just at the point it’s first established.

• Keeps the supplier list reliable: An up-to-date, published membership list matters not just to suppliers but to other contracting authorities deciding whether to use the market.
• Provides transparency on scope changes: Publishing a clear summary of what’s changed – such as a new part or new specifications – lets interested suppliers understand exactly what’s different.
• Protects fairness by what it can’t change: By excluding conditions for membership from what a modification notice can cover, the framework ensures the entry bar stays consistent for every supplier throughout the market’s life.

In Summary

A UK15 notice shows that a Dynamic Market’s membership or scope has changed since establishment – but one thing it will never show is a change to the conditions for membership, which the Act fixes for the life of the market. Suppliers who track UK15 notices can stay current on who’s on a market and what it now covers, without needing to worry about the entry bar shifting underneath them.