UK Competition Law: How It Affects Your Business And Agreements

When you’re busy building a product, finding customers and negotiating deals, “competition law” can feel like something that only matters to big corporations.

But UK competition law can affect small businesses and startups more often than you’d think - especially when you’re partnering with suppliers, joining forces with other businesses, setting pricing rules for resellers, or trying to protect your market position as you scale.

The good news is you don’t need to be a competition lawyer to spot the most common red flags. If you understand what competition law is trying to prevent (and why), you can structure your commercial agreements with far more confidence.

Below, we’ll break down what competition law in the UK is, how it applies to everyday commercial arrangements, the types of behaviour that can create risk, and what practical steps you can take to stay on the right side of the law from day one.

Note: This article is general information only and isn’t legal advice. Competition law is fact-specific (including market definition and market power), so it’s worth getting tailored advice before you rely on any approach in a real deal.

What Is UK Competition Law (And Why Should Small Businesses Care)?

UK competition law (sometimes searched as “competition laws UK” or “anti competition law UK”) is the set of rules designed to keep markets fair. In simple terms, it aims to stop businesses from:

• making secret or unfair agreements that restrict competition,
• abusing market power to squeeze out rivals or exploit customers, and
• merging in ways that reduce competition and harm consumers or other businesses.

In the UK, competition law is mainly enforced by the Competition and Markets Authority (CMA), although sector regulators (like Ofcom or the FCA) can also play a role depending on your industry.

The key legislation you’ll hear about includes:

• The Competition Act 1998 (often the main one for day-to-day business conduct)
• The Enterprise Act 2002 (covers mergers and market investigations, among other areas)

Even if your business is “small”, competition law can still apply to you because:

• it applies to agreements and conduct, not just company size;
• startups often sign distribution, reseller, agency and partnership arrangements where competition issues can pop up;
• you can be exposed through your supply chain (for example, if you follow a competitor’s pricing plan or share sensitive information); and
• the CMA has been increasingly active in sectors involving fast-growing digital and consumer-facing businesses.

It’s also worth knowing that competition issues can cause commercial headaches even before any regulator gets involved - for example, a key clause could be unenforceable, or a deal could unravel mid-negotiation because one party’s lawyers flag a competition risk.

Key Competition Law Risks For Startups And Growing SMEs

From a practical “what should you watch out for?” perspective, competition law risk usually shows up in two ways:

• how you behave in the market (your pricing, sales strategy, responses to competitors, approach to customers); and
• what your contracts say (distribution terms, exclusivity, pricing clauses, non-competes, information sharing and more).

Here are some common scenarios where competition law in the UK can become relevant for small businesses:

1) Pricing And “Keeping The Market Stable” Conversations

It might start innocently: you meet another founder at an industry event, and you both complain about rising costs. Someone suggests the market “can’t keep racing to the bottom” and talks about keeping prices “reasonable”.

Be careful. Agreements or understandings with competitors about prices, discounts, or bidding behaviour can be serious competition law issues - and you don’t need a written contract for regulators to take interest.

2) Distribution And Reseller Relationships

If you sell via resellers, distributors, franchisees or agents, you’ll often want to control things like pricing, where they sell, and whether they can sell competing products.

These are exactly the types of terms that need careful drafting in a Terms and Conditions framework or a bespoke commercial contract - and they can raise competition law concerns if they go too far (particularly around resale pricing and restrictions on where/how resellers can sell).

3) Exclusivity And Long Lock-Ins

Exclusivity can be commercially sensible (for example, a supplier gives you better rates if you buy exclusively from them), but if it significantly limits customer choice or makes it hard for rivals to compete, it can create risk.

4) Collaborations, Joint Ventures, And “Co-Opetition”

Startups often collaborate to move faster - shared R&D, joint marketing, bundling services, or teaming up to bid for work.

Collaboration is often allowed, but it needs structure. A well-drafted Joint Venture Agreement can help set boundaries, especially around decision-making, information access, and what each party can (and can’t) do independently.

5) Scaling Up And Becoming A “Big Player” In A Niche

You don’t need to be a household name to have market power. In some local or niche markets, a business can become dominant relatively quickly (for example, in a specialised B2B service within one region).

Once you have significant power in a market, certain tactics can shift from “tough but fair” to “potentially abusive” under competition law - and the legal assessment is usually highly dependent on market definition and evidence of competitive effects.

Anti-Competitive Agreements: What You Must Avoid (Competition Act 1998)

One of the core ideas in UK competition law is that businesses shouldn’t make agreements that prevent, restrict, or distort competition.

These issues typically fall into two buckets:

• Horizontal agreements - agreements between competitors (often the highest risk)
• Vertical agreements - agreements between businesses at different levels of the supply chain (like supplier/distributor)

High-Risk Examples: Competitor (Horizontal) Behaviour

If you compete with the other party (even if you’re “friendly competitors”), be extremely cautious about:

• price fixing (agreeing prices, discounts, fees, commissions, or minimum price levels)
• bid-rigging (agreeing who will win a tender, or rotating bids)
• market sharing (splitting customers, regions, or sectors between you)
• output limits (agreeing to restrict supply, capacity, or product availability)
• collective boycotts (agreeing not to deal with a supplier or customer)

These can be serious infringements. The consequences can include investigations, fines, director disqualification in some cases, and reputational damage. For a small business, the disruption alone can be huge.

Common Contract Risk: Resale Price Maintenance (RPM)

If you sell through distributors or resellers, one of the classic pitfalls is trying to set the resale price they must charge.

As a general rule, forcing resellers to sell at a fixed or minimum resale price is high-risk in the UK and is often treated as a “hardcore” restriction in vertical arrangements. The detail matters (including any pressure, incentives, penalties, or monitoring that effectively removes the reseller’s freedom to set its own price).

What you can usually do (depending on the detail) is:

• recommend a resale price (RRP), as long as it’s genuinely optional; and/or
• set your wholesale price, leaving the reseller free to decide their retail price.

UK rules on vertical agreements have their own post-Brexit framework (including the UK Vertical Agreements Block Exemption) and UK guidance, so it’s worth getting the drafting right. This is a common area where a properly drafted Distribution Agreement makes a difference - not just commercially, but legally.

Information Sharing: The Hidden Risk In “Friendly” Competitor Chats

Another underappreciated risk is sharing sensitive commercial information with competitors. This can happen in:

• industry associations and networking groups,
• informal founder chats,
• collaborations where boundaries aren’t clear, and
• data-sharing arrangements.

High-risk information can include future pricing, margins, strategic plans, customer lists, pipeline details, and capacity planning. Even if no written agreement exists, regulators can look at whether the information exchange reduced independent decision-making in the market.

If your collaboration requires some information sharing, it’s smart to set clear guardrails in the contract and, where appropriate, add confidentiality protections such as a Non-Disclosure Agreement.

Abuse Of Dominance: When Strong Market Position Becomes A Problem

The next major limb of competition law in the UK is the prohibition on abuse of a dominant position.

Being dominant isn’t illegal. Competing hard and winning business isn’t illegal either.

The issue is how a dominant business behaves - especially where that behaviour harms the competitive process (for example, by excluding competitors in a way that isn’t competition “on the merits”, or by exploiting customers where they have limited alternatives).

What Does “Dominant” Mean In Practice?

Dominance is about market power - your ability to act independently of competitive pressure. It depends on factors like:

• your market share and how concentrated the market is,
• how easy it is for new competitors to enter,
• whether customers can realistically switch away, and
• your control over key inputs, technology, platforms, or routes to market.

Startups and SMEs can still be dominant in a narrow market (for example, a specialist provider with unique technology in a defined geographic area), but “dominance” is a technical assessment and isn’t just about being the most well-known supplier.

Examples Of Potentially Abusive Conduct

This can vary by industry, but typical examples include:

• predatory pricing (pricing so low that it’s likely to be loss-making and capable of excluding equally efficient competitors, with a realistic prospect of recouping losses later)
• unfair trading conditions (imposing terms that may be considered unfair in the competition law sense - typically requiring dominance and a lack of effective competitive constraint)
• refusal to supply in limited circumstances (for example, where access to an essential input is being withheld in a way that is likely to eliminate effective competition and can’t be objectively justified)
• tying and bundling (forcing customers to take a second product/service in a way that forecloses competition)
• exclusive dealing that locks up customers or suppliers in a way that shuts out rivals

If you’re scaling quickly and becoming a key player, it’s worth reviewing how you contract with customers and suppliers, how you set pricing, and how you handle incentives and exclusivity.

From a contract design perspective, you’ll often also want to ensure your documents remain commercially sensible and enforceable. For example, your approach to limitations and risk allocation (including Limitation of Liability wording) should be proportionate and aligned to the deal - especially where counterparties may argue terms are one-sided in practice.

Competition Law In Commercial Agreements: Clauses That Need Care

Most small businesses don’t “break competition law” deliberately. The risk usually comes from standard commercial clauses that feel normal - but can be problematic depending on market context (including market shares, customer switching, and how the restriction works in practice).

Here are key contract areas to pay attention to.

Exclusivity Clauses

Exclusivity can appear in many forms:

• exclusive supply (you only buy from one supplier),
• exclusive distribution (one distributor gets a territory),
• exclusive customer commitments (a customer agrees to purchase only from you), or
• platform restrictions (only selling through one channel).

Exclusivity isn’t automatically illegal. The competition law question is usually:

• how long does it last,
• how wide is it (territory/products/customers),
• does it make it harder for competitors to compete effectively, and
• is there a legitimate efficiency reason (like investment, training, or quality control)?

Territory And Customer Restrictions

Suppliers often want to control where and to whom a distributor can sell. These terms can become sensitive if they restrict “passive sales” (for example, a reseller responding to genuine inbound requests from outside their territory) - and the UK has specific rules and guidance on what’s permitted in vertical agreements.

This is one reason distribution and reseller frameworks should be tailored rather than pulled from a generic template.

Non-Competes And Non-Solicitation In Business-To-Business Deals

Non-competes can appear in:

• commercial collaborations,
• joint ventures,
• sale of business arrangements, and
• founder or shareholder arrangements.

They can be legitimate where they’re needed to protect something real (like goodwill, confidential know-how, or a genuine investment). But if they’re too broad, too long, or not properly justified, they may be unenforceable and can raise competition concerns in some contexts.

If you’re bringing on co-founders or investors, it’s common to address business protections through a Shareholders Agreement rather than trying to “solve everything” with aggressive restraints that might backfire later.

Standard Terms With Customers: Don’t Forget The Competition Angle

Competition law doesn’t just apply to competitor agreements. Issues can also arise from how you structure pricing and conditions in your customer contracts if you have significant market power.

For example, if your Business Terms include strict restrictions on switching, heavy penalties, or bundling that meaningfully limits customer choice, it’s worth sense-checking them for enforceability and competition risk as you grow (particularly if customers have limited alternatives).

Partnerships And Collaborations: Set Clear Boundaries

If you’re collaborating with another business, you’ll want clarity on:

• what you’re doing together (and what you each keep doing independently),
• who owns IP created during the project,
• how pricing and sales decisions are made (without “aligning” competitive behaviour outside the project), and
• what happens when the collaboration ends.

Depending on how you’re working together, this might be documented as a Partnership Agreement, a joint venture arrangement, or a services-style contract. The “right” format depends on your commercial reality - and getting this wrong can create both legal and operational risk.

Practical Steps To Stay Compliant (Without Overthinking It)

Competition compliance doesn’t need to become a massive internal project for a small business. The aim is to build smart habits early, so you don’t accidentally wander into risky territory as you scale.

1) Treat Competitors Differently To Everyone Else

As a rule of thumb, be cautious about discussing the following with competitors:

• future pricing or planned price increases,
• discount levels or sales targets,
• who you will or won’t sell to,
• capacity, output, or expansion plans,
• tender strategy or bid intentions.

If you need to collaborate, document the scope clearly and keep information sharing limited to what’s necessary for that project.

2) Pressure-Test Your “Standard” Commercial Clauses

Clauses like minimum pricing, exclusivity, territorial restrictions, and long non-competes can look normal on paper, but whether they’re acceptable can depend on your market share, your sector, and the structure of the deal.

This is where tailored drafting matters - especially in distribution and reseller arrangements.

3) Train Your Team (Even If Your Team Is Tiny)

If you have sales staff, account managers, or partnerships leads, they’re often the ones having conversations with competitors, suppliers, and channel partners.

A short internal “do and don’t” guide can go a long way. If your business uses internal systems to store or share pricing and strategy documents, it can also help to set clear internal expectations (for example, through an Acceptable Use Policy) so sensitive information is handled appropriately.

4) Get Advice Before You Sign High-Stakes Deals

If you’re about to sign a deal that includes:

• fixed or minimum resale prices,
• wide exclusivity,
• market/customer sharing language,
• unusually long restraints, or
• information-sharing commitments,

it’s worth getting a legal review. It’s usually much cheaper (and less stressful) to fix these issues upfront than to unwind a deal later.

Key Takeaways

• UK competition law applies to small businesses and startups too - especially through everyday commercial agreements like distribution, reseller, and collaboration deals.
• High-risk behaviour often involves agreements between competitors (price fixing, bid-rigging, market sharing) and can be triggered even by informal discussions or information sharing.
• In supply chain contracts, watch out for resale price maintenance, overly strict territorial/customer restrictions, and broad exclusivity that could restrict competition (including under the UK’s post-Brexit vertical agreements framework).
• Abuse of dominance risk increases as you scale and gain market power - dominance itself isn’t illegal, but certain tactics can be.
• Competition compliance is mostly about good habits: avoid risky competitor conversations, structure collaborations carefully, and get your contracts properly drafted and reviewed.
• If a contract clause feels like it’s designed to “lock the market down”, it’s worth pausing and getting advice before signing.

If you’d like help reviewing your commercial agreements or setting up practical legal foundations that support growth, you can reach us at 08081347754 or team@sprintlaw.co.uk for a free, no-obligations chat.