The UK Procurement Act Just Changed. Here's What Every SME Supplier Needs to Know.

The UK Procurement Act 2023 replaced the Public Contracts Regulations 2015, which had governed public contracting in England, Wales and Northern Ireland for over a decade. The change is not cosmetic, it introduced a fundamentally different approach to bid evaluation, supplier disclosure requirements, and how sustainability performance factors into contract awards.

The most significant change for SME suppliers is the Carbon Reporting Plan requirement. For public contracts over £5 million, suppliers must now publish a Carbon Reporting Plan as part of their tender submission. This is not optional. A buyer operating under the new Act cannot simply ignore it, and a supplier who cannot produce one is at an immediate disadvantage - or disqualified entirely depending on how the contract authority has structured its selection criteria.

Beyond the Carbon Reporting Plan, the Act introduced new transparency obligations. Contracting authorities must now publish planned procurements in advance - giving suppliers more lead time to prepare. There is also a new Procurement Review Unit with powers to investigate non-compliant public buyers. And the "exclusion grounds" for suppliers have been updated, with mandatory exclusions now covering a wider range of corporate misconduct.

• Public Contracts Regulations 2015 replaced in full from 24 February 2025
• Carbon Reporting Plan required for all contracts over £5 million
• Sustainability weighting of 10–30% built into evaluation under Most Advantageous Tender (MAT)
• New transparency notices: contracting authorities must publish upcoming procurements in advance
• Applies to central government, NHS, local authorities, and other public bodies in England, Wales and Northern Ireland

If you have been selling to the public sector for years under the old regime and have not updated your tender approach since February 2025, you are bidding under rules that no longer apply.

Under the old Public Contracts Regulations, public buyers were required to award contracts to the "Most Economically Advantageous Tender". MEAT. Price dominated. Social value and environmental performance were often added as tick-box requirements rather than weighted scoring factors.

The new Act replaces MEAT with MAT. Most Advantageous Tender. The word "economically" has been removed deliberately. Under MAT, buyers can weight evaluation criteria across quality, cost, and wider value, including environmental performance and social outcomes. A buyer can now legitimately award to a supplier who is not the cheapest if that supplier demonstrates measurably stronger sustainability performance.

To understand what this means in commercial terms, consider the weighting in practice. If a contract is worth £200,000 and the sustainability criteria carry a 20% weighting, then £40,000 of the evaluation score is determined by your sustainability credentials. A competitor who can demonstrate a documented emissions reduction programme, verifiable waste diversion data, and a published Carbon Reporting Plan will score higher in that 20% than a competitor who cannot. At scale, across multiple contracts, this is a material commercial disadvantage.

The practical effect is that suppliers who have been treating sustainability as a brand story rather than an evidence-based record are now at a scoring disadvantage. The buyer's evaluator does not award points for intention. They award points for documented, verifiable performance - and the MAT framework gives them the authority to let those points determine the award.

There is no single mandated template, the Act specifies the requirement to have a Plan; what evaluators look for draws on the Greenhouse Gas Protocol and the Climate Change Act 2008 targets. A Carbon Reporting Plan that holds up in a tender needs to cover five core areas. Missing any one gives an evaluator grounds to score lower, regardless of actual sustainability performance.

For most SMEs, the barrier is not that the information does not exist - it is that it has never been assembled in one place. Energy bills are in an email folder. Waste contractor records are filed by month. Supplier correspondence is in a shared drive. A Carbon Reporting Plan is, at its core, the act of pulling that scattered evidence into a coherent document with dates, numbers, and named accountability.

Procurement evaluators score against criteria, not against brand names. That said, recognised certifications signal that a third party has verified your claims - which reduces the evaluator's burden of assessment and reduces the risk of awarding to a supplier whose sustainability credentials turn out to be unsubstantiated. Here is a realistic view of the main certifications and how they land in public sector evaluation.

If you are choosing where to invest limited time and money, prioritise building your evidence record first. A certification achieved on top of a strong evidence base is a multiplier. A certification with no underlying documentation is a label that an evaluator will probe - and find thin.

The evaluator reviewing your tender submission is not reading your company values page. They are working through a scoring sheet with criteria, and for each criterion they need evidence that is specific, dated, and verifiable. The question is never "do you care about sustainability" - it is "what have you done, when did you do it, and can you prove it?"

Building an evidence pack is not a preparation task for an imminent tender, it is an ongoing practice. The difference between a strong and weak pack is almost never the number of things a business has done; it is whether those things were recorded at the time.

What good evidence looks like by category

• Energy reduction: Before-and-after kWh consumption figures, ideally from utility bills with dates. For equipment upgrades, include the installation date and the installer's confirmation. "We installed LED lighting in March 2024 and reduced electricity consumption by 15% in the following quarter" is scorable. "We have switched to more efficient lighting" is not.
• Waste diversion: Waste transfer notes from your contractor, showing waste type, volume, and disposal route. Composting records. A dated log from when you changed your waste contractor to one with higher recycling rates. If you have shifted from landfill to recycling, show the before-and-after split.
• Supply chain: A dated record of a supplier review or questionnaire process - who was reviewed, what criteria were applied, and what changed as a result. Even a simple supplier register with a "sustainability criteria" column, updated annually, is better than no documentation.
• Staff training: Training records with dates, attendees, and topics covered. An induction checklist that includes sustainability responsibilities. A lunch-and-learn session recorded in your HR system counts - if it has a date and a list of attendees.
• Travel and transport: Mileage logs, fleet records, or business travel policy documents showing a shift away from high-emission travel. Evidence of cycle-to-work scheme uptake, electric vehicle charging provision, or remote working policy.

None of these require specialist consultants or expensive software. They require the discipline of recording what you are already doing. An evidence pack assembled from twelve months of logged actions - each with a date, a description, and supporting documentation - is more compelling to an evaluator than a freshly purchased certification with no supporting detail.

The timing matters. A buyer evaluating tenders in October 2025 is looking for evidence of actions taken before that date. A business that starts logging its sustainability actions today will have a materially stronger evidence pack in six months than one that waits for an imminent deadline to begin.

If you supply public sector organisations or are planning to, the following three steps are the minimum required to bring your tender position in line with the new Act. None of them require external consultants. All three can be started this week.

1. 1
   Check the Find a Tender Service (FTS) for upcoming contracts in your sector. FTS is the UK government's official portal for procurement notices, replacing the old OJEU/TED system for UK procurements post-Brexit. Set up alerts for relevant contract categories and buyer organisations. The Act requires contracting authorities to publish pipeline notices earlier than before - use this lead time. Even if you are not ready to bid now, knowing what is coming in the next six to twelve months gives you a planning window.
2. 2
   List every sustainability action your business has taken in the last 24 months and identify which ones are already documented. Do not start by asking "what do we need to do" - start by auditing what you have already done. Check utility bills, waste contractor records, supplier correspondence, staff training logs, and any procurement or policy documents. You may find you have done more than you realise. What you are looking for is not the action itself - it is whether you have a dated, specific record of it.
3. 3
   Draft a one-page Carbon Reporting summary from your documented evidence. This is not a polished document - it is a working draft. Use the five-section structure from Section 3 of this article. Write one sentence per action under "reduction actions underway." List your best-documented evidence items under "evidence of actions completed." Identify the gaps. A one-page draft produced from real evidence is the foundation of a full Carbon Reporting Plan. It also immediately shows you where your documentation is thin.

Most SMEs who lose public sector tenders on sustainability criteria are not losing because they have done nothing, they are losing because what they have done is not assembled, dated, and presented in a scorable form. The businesses that win are not necessarily the most sustainable; they have the most legible evidence record. That is a documentation problem, and documentation problems are solvable.