Supplier Exclusion Grounds (UK)

Public procurement law must balance two competing interests: giving all capable suppliers a fair opportunity to compete, and protecting contracting authorities from awarding contracts to suppliers who are dishonest, incompetent, financially unstable, or pose a risk to national security. The Procurement Act 2023 addresses this through a detailed regime of supplier exclusion grounds, which are the defined circumstances in which a buyer must or may bar a supplier from participating in a competition.

What are supplier exclusion grounds?

The Act distinguishes between mandatory exclusion grounds (where the buyer must exclude a supplier if the ground applies) and discretionary exclusion grounds (where the buyer may exclude a supplier after weighing the evidence and proportionality).

Mandatory exclusion grounds include: convictions for specific criminal offences including bribery, fraud, tax evasion, money laundering, modern slavery, and certain competition law infringements; conviction of the organisation or its connected persons for these offences within a defined lookback period; and appearance on the central debarment list maintained by the Cabinet Office.

Discretionary exclusion grounds cover a broader range of circumstances that may indicate the supplier is unsuitable: insolvency or financial distress; grave professional misconduct (such as serious misrepresentation in a previous tender); conflict of interest that cannot be remedied; past poor performance on a public contract resulting in early termination or damages; and failure to pay taxes or social security contributions in any jurisdiction.

A significant new feature of the Act is the introduction of a central debarment list. Where a supplier has been debarred (following an investigation and determination by the government), it appears on this public list and must be mandatorily excluded from all covered procurement by all covered buyers for the duration of the debarment period. This creates a UK-wide exclusion mechanism that did not exist under the old regime.

Suppliers must self-declare on the central supplier registration platform whether any exclusion grounds apply to them. Making a false declaration is itself an exclusion ground.

Why it matters for bidders

Understanding the exclusion grounds is essential for two reasons. First, if any ground applies to your organisation, you must self-declare it and assess whether you can continue to participate. Many discretionary grounds allow for self-cleaning: demonstrating that the circumstances giving rise to the ground have been remedied through organisational reforms, remediation payments, and cooperation with investigators. A well-documented self-cleaning case can overcome a discretionary exclusion ground.

Second, understanding the exclusion grounds helps you protect your supply chain. If a subcontractor or consortium partner is subject to a mandatory exclusion ground, including that partner in your bid could render your entire submission non-compliant. Due diligence on consortium partners and key subcontractors before submitting a bid is a standard risk management step.

Example

A construction company bidding for a GBP 25 million hospital building contract runs due diligence on its proposed specialist subcontractor for mechanical and electrical works. The check reveals that the subcontractor's managing director was convicted of a bribery offence two years ago, which is a mandatory exclusion ground under the Act. The company replaces the subcontractor with an alternative before submitting its tender, avoiding a non-compliant bid.

Frequently Asked Questions

How long do mandatory exclusion grounds last?

The Act specifies the lookback period for each ground. For most criminal convictions triggering mandatory exclusion, the period runs from the date of conviction. The precise durations vary by ground and are set out in the Act. Appearance on the debarment list triggers exclusion for the duration of the debarment period specified in the debarment decision.

Can a supplier self-clean to avoid a mandatory exclusion ground?

Self-cleaning (demonstrating that the circumstances giving rise to the ground have been remedied) is available for discretionary exclusion grounds but not for mandatory grounds. Where a mandatory exclusion applies, the supplier must be excluded regardless of remedial steps taken. Self-cleaning is most relevant where a conviction has occurred but the organisation has undergone fundamental reform.

What happens to connected persons under the exclusion grounds?

The Act extends certain exclusion grounds to "connected persons": individuals associated with the supplier such as directors, partners, and senior managers. If a connected person has a relevant conviction, the supplier may be subject to exclusion on that basis even if the organisation itself was not directly involved in the offending conduct.