UK Competition Law Reform 2026: a Practical Guide for Businesses, What In‑house Counsel and Compliance Teams Must Do Now

The UK government’s consultation paper Refining our competition regime, published in January 2026, marks the most significant proposed overhaul of UK competition enforcement architecture since the Competition and Markets Authority was established in 2014. This UK competition law reform 2026 guide explains what the proposals change, how the CMA’s own Annual Plan for 2026–27 amplifies the enforcement risk, and, critically, what in‑house counsel, compliance officers and senior management need to do now to stay ahead. Alongside procedural reforms to market investigations and Phase II decision‑making, the government has signalled heightened scrutiny of algorithmic pricing practices and a new UK–EU cooperation framework that will reshape cross‑border enforcement.

The practical checklists, audit frameworks and timelines below are designed to turn policy into action for any business operating in the UK market.

At a Glance, Top 5 Immediate Actions

Before diving into the detail, here are the five actions that every general counsel, head of compliance and head of M&A should prioritise immediately.

1. What the 2026 Proposals Actually Change, A Concise Summary

The government’s Refining our competition regime consultation proposes targeted but consequential amendments to the UK’s competition framework. The stated objectives are to improve the speed, proportionality and predictability of competition enforcement while maintaining the robustness of consumer protection. Industry observers expect that, if implemented as proposed, these changes will produce a more centralised, faster‑moving CMA with stronger tools and clearer accountability.

The core proposals fall into five categories:

• Phase II decision‑making reform. The consultation proposes changes to how Phase II merger and market investigation decisions are taken, with the aim of centralising certain decision points to improve consistency and reduce timelines.
• Market studies and market investigations. Proposed reforms would reshape the Phase I market study process, narrowing scope to improve focus and reduce business uncertainty during reviews.
• Procedural speed and proportionality. The government seeks to embed proportionality principles more firmly across all CMA processes, from information requests to the scope of remedies, to reduce the compliance burden on businesses while preserving enforcement effectiveness.
• Merger jurisdiction. The consultation considers adjustments to the jurisdictional thresholds and procedural requirements for merger notifications, with a likely practical effect of altering filing triggers for certain transaction types.
• Governance and accountability. Structural changes to CMA governance and decision‑making panels are proposed to enhance transparency and speed while preserving the quality of economic and legal analysis.

Quick Timeline of Proposals to Policy Milestones

The reform process is expected to move through several stages over the next 12 to 18 months. While exact legislative dates remain subject to parliamentary scheduling, the likely trajectory is as follows:

• January 2026: Publication of Refining our competition regime consultation.
• Spring 2026: Consultation response period closes; government reviews submissions.
• Late 2026: Government response and draft legislation or statutory instrument expected.
• 2027: Early indications suggest implementation of key procedural reforms, subject to parliamentary timetable.

Businesses should not wait for final legislation. Many CMA 2026 reforms will be implemented operationally through revised CMA guidance and practice before any statutory changes take effect. The CMA Annual Plan 2026–27 already signals a shift in enforcement posture.

2. How the CMA’s Powers and Procedures Will Shift, UK Competition Law Reform 2026 Guide to Operational Impact

The CMA’s Annual Plan for 2026–27 provides a concrete preview of how the regulator intends to deploy its existing and anticipated powers over the coming year. Read alongside the government’s consultation, the Annual Plan reveals an authority that is leaner, faster and more interventionist across multiple sectors.

Phase II Decision Process

Under current arrangements, Phase II merger and market investigation decisions are typically taken by specialist inquiry panels with extended timelines. The consultation proposals aim to centralise certain Phase II decision‑making functions, with the goal of improving consistency of outcomes and reducing the elapsed time from referral to final decision. The likely practical effect will be a compression of the window available to parties to negotiate remedies or challenge provisional findings.

Market Investigations Changes

Market investigations in the UK have historically been comprehensive, and lengthy. The 2026 proposals seek to introduce more structured scoping at the Phase I market study stage, so that formal market investigations UK 2026 onwards are narrower and more targeted. This should reduce the burden on businesses subject to review, but it may also mean that investigations, once launched, move more swiftly to adverse findings.

Enforcement and Penalties

The CMA Annual Plan 2026 signals heightened activity in sectors including digital markets, consumer goods, and financial services. Information notices and compulsory interview powers remain the CMA’s primary evidence‑gathering tools, but the consultation contemplates enhanced procedural mechanisms that would strengthen the authority’s hand during dawn raids and document production exercises.

3. Practical Compliance and Governance Changes for Businesses

Understanding the reforms is only half the challenge. In‑house teams must translate the UK competition regime changes 2026 into updated governance frameworks, policies and operational procedures. This section sets out the priority actions.

Board Reporting and Sign‑Offs

Competition risk should feature as a standing item on the board and audit‑committee agenda. In practical terms, this means:

• Quarterly competition risk reporting. The GC or head of compliance should present a concise dashboard covering live investigations, regulatory engagement, algorithmic pricing audit status and compliance training completion rates.
• Board sign‑off on pricing governance. Any material change to pricing strategy, especially the introduction or modification of algorithmic pricing tools, should require documented board or executive committee approval with a competition law risk assessment attached.
• Escalation protocol. Define clear triggers for escalating competition concerns from operational management to legal and from legal to the board. A sample escalation flow runs: operational flag → legal/compliance initial assessment (24 hours) → GC recommendation (48 hours) → board notification if material risk identified.

Contractual Clauses to Review

The reforms warrant a targeted review of key commercial agreements. Priority clauses include:

• Most‑favoured‑nation (MFN) and price‑parity clauses, these face increasing scrutiny and should be reviewed for competition law defensibility.
• Information‑sharing provisions in joint venture, distribution and supply agreements, ensure they are limited to what is strictly necessary and include adequate safeguards.
• Non‑compete and exclusivity clauses, assess whether durations and scope remain proportionate under the likely enforcement approach.
• Data‑sharing and algorithmic collaboration clauses, any provision that enables competitors to access each other’s commercially sensitive data, even indirectly through a shared platform or algorithm, must be reviewed.

Procurement and Pricing Governance

Procurement and commercial teams often operate at the frontline of competition risk. Updated internal policies should address bid‑rigging red flags, competitor contact logging, and clear rules on the use and oversight of dynamic pricing software. Every employee involved in pricing decisions should complete refreshed competition compliance training within the next 90 days.

4. Algorithmic Pricing and Data‑Driven Conduct, Risk and 10‑Point Audit

Algorithmic pricing competition risk is the single fastest‑growing area of enforcement concern for the CMA. As businesses increasingly rely on automated tools to set, adjust and optimise prices in real time, the potential for tacit collusion, hub‑and‑spoke arrangements, and facilitating practices, whether intentional or unintentional, grows exponentially. The CMA’s Annual Plan explicitly identifies algorithmic and data‑driven market practices as a priority, and the 2026 reforms are expected to provide additional procedural tools to investigate these issues.

How to Run a Rapid Algorithmic Pricing Audit

Every business using automated pricing should complete the following 10‑point audit. The competition compliance checklist below is designed to be completed within 30 days by a cross‑functional team including legal, data science, commercial and procurement.

1. Algorithm inventory. Map every algorithm or automated tool that influences pricing decisions, including third‑party software, platform pricing tools and internal models.
2. Data input review. Identify every data source feeding into pricing algorithms. Flag any source that originates from, or is shared with, a competitor, directly or via a common platform.
3. Human oversight assessment. Confirm that meaningful human oversight exists at each stage of the pricing decision chain. Document who has authority to override algorithmic outputs and how frequently overrides occur.
4. Competitor signal check. Assess whether any pricing algorithm monitors competitor pricing in real time and adjusts accordingly. Determine whether this creates a risk of parallel pricing or tacit coordination.
5. Simulated collusion test. Run a controlled simulation to determine whether the algorithm could, under any scenario, produce outcomes equivalent to explicit price coordination. Engage an economist or data scientist to conduct and document this exercise.
6. Vendor contract review. Review contracts with third‑party pricing software providers. Ensure that vendors do not have access to, or the ability to aggregate, pricing data from competing clients.
7. Documentation and audit trail. Confirm that the algorithm’s logic, parameters, inputs and outputs are documented in a form that could be provided to the CMA in response to an information notice.
8. Log retention policy. Establish a minimum retention period for algorithmic pricing logs (industry observers expect the CMA to request at least two years of historical data in investigations).
9. Ex‑ante risk assessment. Before any new pricing algorithm is deployed or materially modified, require a documented competition law risk assessment signed off by legal counsel.
10. Governance framework. Assign board‑level or executive committee ownership of algorithmic pricing compliance, with clear reporting lines and accountability.

Red Flags for Enforcement

Certain patterns are more likely to attract CMA attention. Businesses should be alert to:

• Pricing algorithms that consistently match or shadow a specific competitor’s prices within very short time intervals.
• Use of a common third‑party pricing platform by multiple competitors in the same market.
• Algorithms that incorporate competitor cost data or margin assumptions not available from public sources.
• Absence of any documented competition law assessment before an algorithm was deployed.
• Internal communications suggesting that pricing algorithms were designed or modified to “follow the market” or “maintain price discipline.”

5. M&A, Market Investigations and Transactional Implications

The proposed merger jurisdiction changes and accelerated Phase II timelines will have immediate practical consequences for deal teams. In‑house M&A counsel should reassess both pipeline and future transactions against the emerging framework.

Pre‑Deal Red Flags

Under the anticipated CMA 2026 reforms, the following deal characteristics will likely attract heightened scrutiny:

• Transactions in sectors identified as CMA Annual Plan priorities, including digital markets, consumer goods and financial services.
• Deals involving acquirers with existing market positions at or near the thresholds under review.
• Acquisitions of nascent competitors or innovative entrants, even where turnover is below current notification triggers.
• Transactions with a cross‑border dimension that falls within the new UK–EU cooperation framework.

Deal Process Mapping Under New Timings

The table below provides a practical framework for mapping due diligence tasks to the anticipated procedural changes.

Early engagement with the CMA, via informal guidance or pre‑notification discussions, is likely to become even more important. Where the reforms compress review timelines, parties that arrive well‑prepared with clear data packs, customer analysis and proposed remedies (if applicable) will be better positioned to secure timely clearance.

6. UK–EU Competition Cooperation 2026, What Businesses Must Update

The new UK–EU Competition Cooperation Agreement establishes a formal framework for the CMA and European Commission to share information, coordinate investigations and align on remedies in cross‑border cases. For businesses operating in both markets, this is a material change.

Practical Steps for Cross‑Border Cases

UK–EU competition cooperation 2026 means that parallel investigations will be more closely coordinated than at any point since Brexit. Businesses should take the following practical steps:

• Appoint coordinated external counsel. Ensure that legal teams on both sides of the Channel are briefed together and operate from a shared case strategy, while respecting distinct procedural requirements.
• Harmonise data rooms and document production. Assume that information provided to the CMA may be shared with the European Commission (and vice versa) under the cooperation framework. Review all submissions for consistency before filing.
• Align leniency and cooperation strategies. If considering a leniency application or voluntary cooperation in one jurisdiction, assess the implications for the other jurisdiction immediately. The cooperation agreement facilitates information flow that may accelerate parallel investigations.
• Update internal policies. Cross‑border compliance policies, competition training materials and escalation protocols should all reference the new cooperation framework and explain the practical implications for employees in both jurisdictions.

7. 90/180/365‑Day Action Plan, Your UK Competition Law Reform 2026 Guide Playbook

The following action plan breaks the compliance response into three phases. Each item is assigned an owner and a deliverable to ensure accountability.

A downloadable one‑page competition compliance checklist summarising these actions is available for in‑house teams to adapt and implement.

8. What to Do If the CMA Knocks, Immediate Operational Playbook

Even the best‑prepared compliance programme cannot eliminate the risk of a CMA investigation. If the CMA contacts your business, whether by dawn raid, information notice, or compulsory interview request, the first 24 hours are critical.

• Step 1: Activate the response protocol. Contact your designated external competition counsel immediately. Notify the GC and the board member responsible for legal risk within one hour.
• Step 2: Verify the CMA’s authority. Check the warrant or notice carefully. Confirm the scope, what documents, data and premises are covered. Do not provide access beyond the stated scope without legal advice.
• Step 3: Preserve privilege. Identify and segregate any legally privileged material before it is reviewed. Ensure a lawyer is present to assert privilege claims in real time during any on‑site inspection.
• Step 4: Secure algorithmic and digital evidence. If the investigation concerns pricing or digital practices, immediately preserve all algorithmic logs, pricing data, model parameters and audit trails. Ensure no automated data‑deletion processes run during the investigation period.
• Step 5: Control internal communications. Issue a litigation hold notice to all relevant custodians. Remind employees not to destroy, alter or remove any documents (physical or digital) and not to discuss the investigation on informal channels.

Communications Script for Executives

Prepare a brief, approved script for senior executives to use if approached by CMA officials during a dawn raid or site visit. The script should confirm cooperation, direct all substantive questions to external counsel, and avoid any admission or speculation about the subject matter under investigation. Rehearsing this script in a tabletop exercise, before any real investigation, is strongly recommended.

Conclusion, Act Now, Not When the Legislation Passes

The UK competition law reform 2026 guide set out above is designed to be acted on today, not filed for future reference. The government’s consultation is live, the CMA’s enforcement posture for 2026–27 is set, and the UK–EU cooperation framework is operational. Businesses that wait for final legislation before updating their compliance programmes will find themselves behind the curve, and potentially exposed to enforcement action taken under existing powers wielded with renewed vigour.

The practical steps are clear: complete the algorithmic pricing audit, refresh investigation‑readiness protocols, brief the board, reassess live transactions and update cross‑border coordination. The competition compliance checklist and 90/180/365‑day action plan above provide a structured path from policy awareness to operational readiness. For businesses seeking tailored guidance on any aspect of the CMA 2026 reforms, engaging an experienced UK competition law specialist is the single most effective step to manage risk in a rapidly evolving enforcement landscape.

Sources

1. GOV.UK, Refining our competition regime consultation page
2. GOV.UK, Refining our competition regime consultation document (PDF)
3. Clifford Chance, The UK Government’s Proposed Changes to the Competition Regime
4. Linklaters, Government Proposes Amendments to UK Competition Regime: What You Need to Know
5. White & Case, CMA Charts a New Course for 2026/27
6. Macfarlanes, UK and EU Competition Law and Policy: What to Look Out for in 2026
7. Stephenson Harwood, What Does the New UK–EU Competition Cooperation Agreement Mean for Businesses?