How to Appeal a Bid Decision: Your Rights Under UK Procurement Law (2026)
Appealing a bid can be extremely beneficial.
Losing a bid you believed was genuinely the strongest submission is frustrating. Losing one where you suspect the evaluation was conducted incorrectly — where the criteria were not applied consistently, the award notice contains errors, or the process itself appears to have been compromised — raises a different question entirely. In that situation, you may have legal rights under UK procurement legislation that allow you to formally challenge the decision.
This guide explains exactly what those rights are under the Procurement Act 2023, how the challenge process works in practice, what the realistic outcomes are, and — critically — what to consider before deciding whether to pursue a formal challenge. This is not legal advice; for a specific procurement dispute, you should take specialist legal counsel. But this guide gives you the framework to understand your position and make an informed decision about whether and how to act.
For the complete overview of how public sector tendering works, see our guide to tendering for contracts. For understanding and using the debrief process — which should always precede any consideration of a formal challenge — see our guide to understanding tender feedback.
Before You Consider an Appeal: Request a Debrief
The first and most important step after any unsuccessful bid — before considering any formal challenge — is requesting a debrief from the buyer. Under the Procurement Act 2023, contracting authorities are required to provide feedback to unsuccessful suppliers on request. The debrief gives you your evaluation scores on each quality question, qualitative feedback on responses that underperformed, and — where available — comparative information against the winning submission.
In the large majority of cases, the debrief reveals a straightforward explanation for the outcome: your evidence was insufficient, a component of a question was not fully addressed, your pricing was out of range, or a competitor’s social value response was more specific and locally relevant than yours. These are not grounds for appeal — they are grounds for improvement. Our guide to win loss analysis covers how to extract maximum learning from every debrief and apply it systematically to subsequent submissions.
A formal challenge is appropriate only where the debrief reveals — or where you have other evidence suggesting — that the procurement process itself was conducted incorrectly. That is a higher bar than simply believing your submission was better than the one that won.
Your Legal Rights Under the Procurement Act 2023
The Procurement Act 2023, which came into force in February 2025, replaced the Public Contracts Regulations 2015 and introduced several significant changes to supplier rights in procurement challenges. The key provisions relevant to a supplier considering an appeal are:
The right to a debrief
All unsuccessful suppliers have the right to request a debrief from the contracting authority. Under the Procurement Act 2023, the authority must respond within a defined period. The debrief must include the scores awarded to your submission, the scores of the winning submission where possible, and the reasons for the decision. This right exists regardless of contract value — it is not limited to above-threshold procurements.
The mandatory standstill period
For above-threshold contracts, the Procurement Act 2023 requires a mandatory standstill period — typically eight working days from the date all unsuccessful suppliers are notified of the outcome — before the contract can be formally signed. This standstill period exists specifically to give unsuccessful suppliers the opportunity to review the decision and take action if they believe the process was flawed. If you intend to challenge a procurement decision, you must act within the standstill period — waiting until after the contract is signed significantly limits your available remedies.
The right to challenge in court
Suppliers who believe a contracting authority has breached its procurement obligations can bring a legal challenge in the Technology and Construction Court (TCC). Under the Procurement Act 2023, the grounds for challenge include: failure to comply with the duty to treat suppliers equally and without discrimination; failure to conduct the procurement transparently; breach of specific procedural requirements under the Act; and manifest error in the evaluation of submissions. The time limit for bringing a challenge is 30 days from the date the challenger knew or ought to have known of the breach — though for challenges relating to the award decision specifically, the standstill period is the operative window for pre-award remedies.
Automatic suspension
Where a legal challenge is commenced within the standstill period, an automatic suspension of the contract award takes effect — preventing the contracting authority from signing the contract until the challenge is resolved or the court lifts the suspension. This automatic suspension is one of the most powerful tools available to a challenger, as it preserves the commercial opportunity while the challenge is heard. However, courts will lift the suspension if the authority demonstrates that the balance of convenience favours proceeding with the contract.
What Constitutes Valid Grounds for an Appeal?
Not every outcome you disagree with is a valid basis for a formal procurement challenge. The courts apply an objective standard — was the procurement process conducted in breach of the contracting authority’s legal obligations? — not a subjective one about which submission was better. The most commonly cited valid grounds in successful procurement challenges include:
Manifest error in evaluation. The authority applied the evaluation criteria in a way that is clearly and demonstrably wrong — for example, awarding a score that is inconsistent with the mark descriptors published in the ITT, or failing to apply the stated criteria at all. This is different from simply disagreeing with the scores your submission received. You must be able to point to a specific, objective error — not a different interpretation of the criteria.
Breach of equal treatment. The authority treated different suppliers differently in a way that was not justified by the procurement documents — for example, by allowing one supplier to amend a submission after the deadline, by sharing information with one supplier that was not shared with others, or by applying the evaluation criteria inconsistently between submissions.
Lack of transparency. The authority failed to publish sufficient information about the evaluation criteria, the award decision, or the reasons for the outcome — in a way that prevented suppliers from understanding how the competition was conducted.
Procedural irregularity. The authority failed to comply with a specific procedural requirement of the Procurement Act 2023 — for example, failing to observe the standstill period, failing to provide the required information in the award notice, or using a procurement procedure that was not appropriate for the contract type.
What to Consider Before Pursuing a Formal Challenge
A formal procurement challenge is a serious commercial and legal step. Before pursuing one, consider the following honestly:
Do you have evidence of a genuine breach, or just a belief your submission was better? Believing your submission was superior to the one that won is not grounds for a legal challenge — evaluators have legitimate discretion in how they apply criteria, and courts do not re-run procurement evaluations. You need specific, objective evidence of a procedural breach or evaluation error, not a subjective assessment of relative submission quality.
What are the realistic remedies? The available remedies in a successful procurement challenge depend on whether the contract has been signed. Pre-award (during the standstill period), a successful challenge can result in the award decision being set aside and the procurement re-run or re-evaluated. Post-award, the most likely remedy is financial damages rather than the contract itself — the court will rarely set aside a contract that has already been signed and is being performed, particularly where doing so would cause significant public disruption.
What is the commercial cost of the challenge? Legal proceedings in the Technology and Construction Court are expensive — typically involving specialist procurement law solicitors and potentially senior counsel. The costs of an unsuccessful challenge are likely to be awarded against you. Even a successful challenge may recover only a portion of your legal costs. Weigh the likely cost of the challenge against the realistic commercial value of the contract and the probability of a successful outcome.
What is the impact on your relationship with the buyer? A formal procurement challenge is an adversarial process. Even where it is ultimately successful or settled, it affects your commercial relationship with the contracting authority. For organisations that depend on ongoing procurement relationships with a specific buyer — particularly in local authority, NHS, or central government markets — the relationship cost of a challenge is a relevant commercial consideration.
Have you exhausted non-legal options? Before commencing legal proceedings, consider whether the issue can be resolved through dialogue with the authority’s procurement team, escalation to the senior responsible officer for the procurement, or a formal complaint to the relevant oversight body. These routes are less adversarial and occasionally resolve genuine errors without litigation.
The Practical Alternative: Learn and Improve
In the vast majority of unsuccessful bids, the right response is not a legal challenge — it is a systematic process of learning, improvement, and resubmission. The suppliers with the highest long-term win rates are almost never those who challenge outcomes; they are those who extract the most learning from every debrief and apply it most rigorously to the next submission. Our guide to win loss analysis covers exactly how to do this, and our guide to understanding tender feedback covers your debrief rights and how to use them.
Frequently Asked Questions About Appealing a Bid
Can I appeal a bid decision if I think my submission was better?
Not on those grounds alone. A legal procurement challenge requires evidence of a specific breach of the contracting authority’s procurement obligations — manifest error in evaluation, breach of equal treatment, lack of transparency, or procedural irregularity. Believing your submission was stronger than the one that won is not sufficient grounds for a formal challenge. Request a debrief first, and assess whether the scores and feedback reveal a genuine procedural breach rather than a difference of opinion about quality.
How long do I have to challenge a procurement decision?
The standstill period — typically eight working days from notification of the award decision for above-threshold contracts — is the critical window for pre-award challenges. If you intend to challenge before the contract is signed, you must act within this period. The general limitation period for bringing a procurement challenge in court is 30 days from the date you knew or ought to have known of the breach, but the standstill period is the operative window for preserving the most effective remedies. Take specialist legal advice immediately if you are considering a challenge — do not wait.
What happens if I challenge after the contract has been signed?
Post-award remedies are significantly more limited. Courts will rarely set aside a contract that is already being performed, particularly where doing so would cause significant disruption to public services. The most likely remedy for a successful post-award challenge is financial damages — compensation for the costs incurred in the procurement exercise and potentially for the loss of the contract opportunity. This is substantially less valuable commercially than a pre-award remedy that results in the award decision being reconsidered.
Is there a free way to challenge a procurement decision?
Formal legal proceedings require specialist legal representation, which is not free. However, some non-legal options are available at lower cost: a formal written complaint to the contracting authority’s procurement team, escalation to the chief executive or cabinet member responsible, or a complaint to the relevant oversight body (for example, the Local Government and Social Care Ombudsman for local authority procurement, or NHS England for NHS procurement). These routes do not carry the force of legal proceedings but can resolve genuine errors without litigation costs.
Can I challenge a below-threshold procurement decision?
The standstill period and the full suite of Procurement Act 2023 remedies apply primarily to above-threshold procurements. For below-threshold contracts, the legal position is less clear-cut — contracting authorities still owe basic duties of fairness and transparency, but the specific procedural requirements and the range of available remedies are more limited. Take specialist legal advice if you are considering challenging a below-threshold procurement outcome.
Should I tell the buyer I am considering a challenge?
There is no requirement to notify the buyer before commencing legal proceedings. However, raising your concerns directly with the authority’s procurement team — either informally or in writing — before taking legal action sometimes resolves genuine errors more quickly and at lower cost than litigation. It also demonstrates that you attempted resolution by other means, which courts sometimes view positively. If direct engagement does not resolve the issue within the standstill period, take legal advice immediately.
Need Support After a Difficult Bid Outcome?
Together: The Hudson Collective does not provide legal advice on procurement challenges — for that, you need specialist procurement law solicitors. What we do provide is expert support in understanding your debrief, identifying what specifically went wrong in your submission, and producing stronger future submissions that reduce the likelihood of a disappointing outcome.
If you have received an unsuccessful bid outcome and want help understanding the feedback, developing a stronger response for the next opportunity, or assessing what genuinely went wrong, get in touch. We hold an 87% win rate across all sectors and have supported organisations across 52 countries in improving their tendering results.
Get in touch with our bid writing team today.
About the author: Written by Joshua Smith, a seasoned bid-writing expert with experience across the UK, Middle East and US, helping organisations secure the contracts they deserve through high-quality, competitive tender responses.