Assessment summaries are no longer simply good practice. Under the Procurement Act 2023, they are a legal requirement and a central part of how contracting authorities demonstrate transparency, fairness and defensibility at award stage.
For local authorities, the key issue is not just providing feedback, but ensuring that the content meets the statutory standard. A summary that is too vague or incomplete may expose the authority to challenge, even where the evaluation itself was carried out correctly.
The legal purpose of an assessment summary
The assessment summary must provide each bidder with sufficient information to understand how the authority reached its decision.
This is not optional narrative. It is a legal transparency requirement designed to allow an unsuccessful bidder to assess whether the procurement was conducted lawfully and whether there are grounds for challenge.
In practice, the question councils should ask is simple. Would a reasonably informed bidder understand why they lost and why the winner was selected?
What must legally be included for unsuccessful bidders
For unsuccessful bidders, the authority must provide information that explains both their own performance and the advantage of the winning tender.
This includes the score awarded to the bidder and an explanation of how that score was reached against the published criteria.
Crucially, the authority must also describe the characteristics and relative advantages of the successful tender. This is a legal requirement and cannot be omitted.
The explanation must be meaningful. Generic statements or high-level summaries that do not explain the actual differentiators are unlikely to meet the legal standard.
What must be included for the successful bidder
For the successful bidder, the summary should confirm the outcome and explain how their tender met the authority’s requirements and achieved the highest evaluation result.
Although the successful bidder does not require comparative detail about others, the explanation must still be accurate, consistent and aligned with the evaluation record.
Any inconsistency between summaries issued to different bidders can create significant legal risk.
How much detail is legally required
The law does not prescribe a fixed template or level of detail. Instead, it applies a functional test.
The authority must provide enough information to explain the decision and allow an informed bidder to understand the outcome.
This means that the level of detail will vary depending on the complexity of the procurement, the criteria used and the differences between bids.
However, minimal or formulaic responses are unlikely to be sufficient.
Frequently asked questions
Do councils legally have to include the winning supplier’s scores?
There is no absolute legal requirement to disclose a full scoring breakdown for the winning bidder in every case.
However, the authority must provide sufficient information to explain the relative advantage of the winning tender. In many procurements, this will require at least some indication of comparative scoring or performance.
If no meaningful comparative information is provided, the authority risks failing the legal requirement to explain the outcome.
Do councils have to include the winning supplier’s comments?
No, there is no legal requirement to disclose full evaluator comments, moderation notes or internal scoring discussions.
However, the authority must summarise the reasons why the winning bid was stronger. This must reflect the actual evaluation findings, not generic or standard wording.
Can councils withhold or redact information?
Yes, authorities may withhold information where disclosure would breach confidentiality or reveal commercially sensitive material.
However, this does not remove the obligation to provide a meaningful explanation. Excessive redaction that prevents understanding of the decision may not be compliant.
Do assessment summaries need to match evaluation records?
They do not need to replicate evaluation notes word for word, but they must be consistent with them.
If the reasoning in the summary differs from the documented evaluation, the authority may struggle to defend its position if challenged.
What happens if an assessment summary is inadequate?
If the summary is too vague or incomplete, suppliers may request clarification, raise complaints or initiate legal challenge.
In some cases, this can delay contract award or expose the authority to increased scrutiny and risk.
What councils should do now
Authorities should review assessment summary templates against the legal requirement to explain both the bidder’s own performance and the relative advantage of the winning tender.
They should test recent summaries and ask whether they genuinely explain the decision or rely on generic language.
Procurement teams should also ensure moderation records are detailed enough to support the explanation provided. If the reasoning is not captured at evaluation stage, it becomes difficult to evidence later.
Why this is a wider governance issue
Assessment summaries are not just about bidder communication. They are a direct reflection of the authority’s procurement governance.
Weak summaries often indicate deeper issues, such as unclear evaluation criteria, inconsistent moderation or poor record keeping. Addressing the summary in isolation is rarely enough.
Authorities that treat this as part of their overall commercial control environment will be in a stronger position.
Support with Procurement Act implementation
For councils reviewing their Procurement Act implementation, including evaluation design, moderation and legally compliant assessment summaries, further guidance is available through the Prestige Commercial Consulting website: https://prestigecommercialconsulting.co.uk/
Where authorities are dealing with complex or high-risk procurements and require tailored advice, the team can be contacted directly here: https://prestigecommercialconsulting.co.uk/contact
The takeaway
Assessment summaries are now a legal compliance requirement, not a procedural formality.
Councils do not need to disclose every detail of the winning bid, but they must provide enough information to explain why it was successful.
If an informed bidder cannot understand the decision from the summary alone, the authority is likely to face questions that could have been avoided.