Heads of Agreement and Letters of Offer: What UK Businesses Should Check

Heads of agreement and letters of offer often look harmless. They can feel like a stepping stone before the "real" contract arrives. But UK businesses regularly get caught by three avoidable mistakes: signing a document without checking whether any parts are legally binding, relying on verbal promises that never make it into the written terms, and spending money on setup before key terms are actually locked in.

This matters most when a deal is moving quickly. A landlord wants confirmation, an investor wants momentum, or a supplier sends over a short offer letter and asks for a signature by close of business. At that point, founders often focus on price and timing, while missing exclusivity clauses, break costs, confidentiality wording, or obligations to keep negotiating in good faith.

This guide explains what a heads of agreement or letter of offer usually means in the UK, which clauses need close review before you sign, and where businesses commonly trip up when they assume a short document has no legal bite.

Overview

A heads of agreement or letter of offer can be partly binding, fully non-binding, or a mix of both, depending on the wording and the context. The main risk is assuming it is only a summary, when in practice it may create immediate obligations or shape later negotiations in a way that is hard to unwind.

The safest approach is to treat the document seriously before you sign, especially if you are about to commit time, cash, staff, or exclusivity to the deal.

• Whether the document is intended to be legally binding, non-binding, or only binding in part.
• Which clauses apply immediately, such as confidentiality, exclusivity, deposits, costs, access rights, or governing law.
• Whether key commercial terms are clear enough to avoid later arguments over price, scope, timing, or conditions.
• Any deadlines, milestones, or events that allow either side to walk away.
• Whether the document wrongly assumes a later contract will fix gaps that should be agreed now.
• How verbal statements, side emails, and draft mark-ups are dealt with.
• Who is signing, in what capacity, and whether the right company entity is named.

What Heads of Agreement Letter of Offer Review Means For UK Businesses

A review is about finding out what you are actually committing to before you sign, not just checking whether the headline deal sounds good.

In the UK, businesses use heads of agreement, heads of terms, letters of intent and letters of offer in many different settings. You may see them in property deals, supply arrangements, distribution deals, acquisitions, investment discussions, franchise negotiations, manufacturing arrangements, technology projects, and larger outsourcing contracts.

The name of the document does not decide its legal effect. A document called "non-binding heads of agreement" can still contain binding clauses. A short letter of offer can also become enforceable if it sets out essential terms clearly and shows both parties intended to be bound.

Why businesses use these documents

These documents usually sit between early discussions and the full contract. They can help parties move forward where the broad commercial position is agreed, but the long form drafting still needs work.

That can be useful where the parties need to record momentum, secure a period of exclusivity, allow due diligence, or set out the structure of a transaction before spending more money.

For example, a growing retailer might agree heads of terms for a new commercial lease before instructing fit-out contractors. A software company may receive a letter of offer from a reseller before both sides finalise service levels and liability caps. A buyer in an acquisition may sign heads of agreement before accountants and lawyers complete detailed due diligence.

Why review matters even if the document says "subject to contract"

"Subject to contract" helps, but it does not solve everything. It usually signals that the parties do not yet intend to be bound by the whole deal, but specific clauses may still be binding if drafted that way.

This is where founders often get caught. They see "subject to contract" at the top of the page and assume there is no legal risk in signing. Then they discover they are tied into an exclusivity period, required to keep information confidential, or expected to cover their own costs regardless of whether the deal proceeds.

What a legal review usually focuses on

A practical review looks at both the legal effect and the commercial pressure points. The question is not only "is this enforceable?" but also "what trouble could this create if the deal changes next week?"

That usually includes:

• whether the language creates binding obligations now
• whether the key terms are certain enough to be enforceable
• whether any important points are missing or too vague
• whether the document aligns with what was agreed in meetings or emails
• whether the terms put one party under pressure before the full contract is ready

It also means checking the commercial reality. If you are about to stop negotiating with others, disclose confidential information, reserve stock, instruct consultants, or put down a deposit, the short document matters a lot more than its length suggests.

Legal Issues To Check Before You Sign

The most important question before you sign is simple: which parts of this document will bind us immediately, and what happens if the wider deal never completes?

1. Binding or non-binding status

Every review should start here. The document should say clearly whether it is intended to create legal relations, and if so, which clauses are binding now.

Some businesses prefer wording that says the commercial terms are non-binding until a formal agreement is signed, except for specific clauses. If that is the intention, the document needs to say so cleanly and consistently. Mixed wording often causes disputes.

Look closely at:

• references to "subject to contract"
• statements that the parties "intend" or "agree" to enter a later contract
• clauses saying certain sections are immediately binding
• language that sounds final on key terms such as price, quantity, delivery, or exclusivity

If the wording is inconsistent, a court may look at the whole document and the surrounding conduct, not just the title.

2. Key commercial terms

If a point matters commercially, it should not be left to assumption. Short documents often summarise the deal, but they still need enough clarity to avoid confusion and false expectations.

Check whether the document properly identifies:

• the products, services, assets, shares, or property involved
• the price or pricing mechanism
• payment timing and any deposit arrangements
• key deliverables, milestones, and deadlines
• who is responsible for due diligence, approvals, licences, consents, or third party sign-off
• whether the deal depends on finance, board approval, landlord consent, or another condition

Vague wording can create two problems. First, it may make the deal hard to enforce. Second, it can create enough practical pressure that one side feels stuck with terms they never fully agreed.

3. Exclusivity and no-shop clauses

An exclusivity clause can be one of the most commercially significant parts of the document.

If you agree not to negotiate with anyone else for a period, you may lose leverage quickly. That may be acceptable if the other side is committing to a timetable, sharing due diligence costs, or progressing the deal in good faith. It is riskier if the exclusivity period is open-ended or the other side can walk away easily.

Before you sign, check:

• how long exclusivity lasts
• whether it starts on signature or another trigger date
• what activities are restricted
• whether there are carve-outs for existing discussions or internal planning
• what happens if the other party delays or stops engaging

4. Confidentiality and use of information

Confidentiality obligations are often binding even where the rest of the document is not. That is usually sensible, but the wording still needs care.

You should understand what counts as confidential information, who can receive it, what use is allowed, how long the obligations last, and whether information must be returned or destroyed if the deal falls away.

This matters especially where you are sharing customer information, pricing, product plans, software specifications, financial figures, or supplier arrangements. If personal data will be shared as part of due diligence, UK GDPR obligations and data protection issues may also need separate attention before any transfer takes place.

5. Costs, deposits and break fees

Do not assume each side simply pays its own costs unless the document says so.

Some heads of agreement say each party bears its own legal and professional costs. Others include deposits, reservation fees, break fees, or non-refundable payments if one side withdraws after a certain point. Those clauses can have real financial consequences before the long form contract is signed.

Check:

• whether any payment is refundable
• when a payment becomes due
• what event triggers forfeiture or repayment
• whether interest or administration charges apply
• whether the clause works fairly if the other side causes the deal to fail

6. Conditions precedent and walk-away rights

A sensible document should be clear about what still needs to happen before the main deal can complete.

Common conditions include finance approval, due diligence, landlord consent, regulatory clearance, board sign-off, references, technical testing, or negotiation of final form documents. If those conditions are missing or badly drafted, parties can end up arguing about whether they were ever truly committed.

It also helps to spell out when either side may walk away. If a deadline passes, if due diligence reveals a material issue, or if final documents are not agreed by a certain date, the exit route and termination rights should be clear.

7. Entire agreement, reliance and verbal promises

Before you rely on a verbal promise, make sure it appears in the document or is clearly preserved for the final contract.

Founders often make decisions based on statements in meetings, WhatsApp messages, or email chains. Later, the signed document says something narrower, or includes wording that the parties have not relied on outside statements. That can create a serious mismatch between what was discussed and what was actually recorded.

If there is a critical promise about territory, minimum orders, exclusivity, timing, access rights, or future investment, get it stated clearly.

8. Liability, remedies and dispute mechanics

Even a short preliminary document can allocate risk. Some include liability limits, indemnity-style wording, specific remedies for breach, or liability clauses and dispute resolution provisions.

You should understand whether one side can seek damages for breach of confidentiality or exclusivity, whether urgent court action is contemplated, and which law and jurisdiction apply. For UK businesses dealing cross-border, this point is easy to miss and can change the practical risk profile significantly.

9. Parties, authority and signature mechanics

The right entity must sign, and the signer must have authority to bind it.

This sounds basic, but mistakes are common where a founder signs in a personal name, a group business uses the wrong company in the header, or the document refers to a trading name rather than the actual legal entity. Those errors can create confusion over who is committed, who is paying, and who can enforce the terms.

Before you sign, confirm:

• the full legal names of the parties
• company numbers where relevant
• registered office details if appropriate
• whether the signatory has authority
• whether execution needs to follow any company signing formalities

Common Mistakes With Heads of Agreement Letter of Offer Review

The biggest mistake is treating a short pre-contract document as a formality when it often sets the tone, leverage and immediate risk for the whole deal.

Assuming the title decides everything

Many business owners think a "letter of offer" is informal and "heads of agreement" is non-binding. Neither assumption is safe. The legal effect depends on the wording, structure, and surrounding circumstances.

A two-page letter can create real obligations. A longer heads of terms document can be mostly aspirational. The title helps less than people expect.

Focusing only on price

Price matters, but many disputes start elsewhere. Exclusivity periods, timing obligations, due diligence access, deposit terms, and vague conditions can cause more practical damage than a small pricing disagreement.

This often happens when a founder agrees a headline number and signs quickly to keep momentum, then discovers the other side has no clear deadline to complete or has broad rights to use shared information during negotiations.

Signing before internal approvals are sorted

Businesses sometimes sign first and seek board, shareholder, lender, landlord, or group-level approval later. That can be risky if the document does not clearly state that completion depends on those approvals.

If an approval is genuinely required, the document should say so. Otherwise, the business may appear committed while still depending on someone else's consent.

Leaving key terms for "the proper contract"

Some points can wait for the long form agreement, but not everything should. If an issue is central to whether the deal works, it should be raised now.

Common examples include:

• who owns intellectual property created during early project work
• who pays for tooling, samples, or preliminary design
• whether a deposit is refundable
• what service levels or deliverables are expected
• whether the business can keep talking to alternative suppliers or buyers

The later contract cannot always fix commercial damage already done.

Spending money too early

Before you spend money on setup, check whether the document actually protects your position if the deal falls away.

Businesses often commit to stock, fit-out, recruitment, software configuration, product development, or consultants based on a signed offer letter. If the wider contract never materialises, that spend may sit entirely with them unless the paperwork says otherwise.

Ignoring inconsistency between drafts, emails and meetings

Deals move fast, and the version that gets signed is not always the version everyone thinks they agreed.

Founders should check whether the final text matches the latest commercial discussions. If someone says "we can sort that later", pause and ask whether the point should be recorded now. This is especially important before you accept the provider's standard terms or a landlord's template wording.

Missing sector-specific issues

Some transactions need more than general contract review. A property letter of offer may need commercial lease-specific scrutiny. A software deal may need attention on data use, intellectual property and service levels. A manufacturing arrangement may need quality control, acceptance testing and supply continuity terms.

The document should reflect the actual business model, not just generic deal language.

FAQs

Are heads of agreement legally binding in the UK?

Sometimes. Some are fully non-binding, some are partly binding, and some can be enforceable on core points. The answer depends on the wording, the certainty of the terms, and whether the parties intended legal relations.

Is a letter of offer the same as a contract?

Not always, but it can still create contractual obligations. A short letter may be enough to form a binding agreement if it contains clear essential terms and shows an intention to be bound.

Does "subject to contract" mean I am safe to sign?

No. That phrase can help show the full deal is not yet final, but individual clauses such as confidentiality, exclusivity, costs or governing law may still bind you immediately.

Can I rely on verbal promises made during negotiation?

You should be cautious. If a promise matters to the deal, ask for it to be written into the document or clearly carried through into the final contract. Verbal statements are much harder to prove and may be excluded by the signed wording.

When should a business get a heads of agreement or letter of offer reviewed?

Ideally before you sign, before you stop talking to other parties, and before you spend money on setup or due diligence. Early review is usually far cheaper than trying to fix leverage problems after signature.

Key Takeaways

• A heads of agreement or letter of offer is not automatically harmless just because it is short or preliminary.
• The key issue is whether any part of the document is legally binding now, especially confidentiality, exclusivity, costs, deposits and dispute clauses.
• Do not rely on the title alone. The wording, certainty of terms, and surrounding context matter more.
• Before you sign, make sure the commercial essentials are clear, the right entity is named, and any approvals or conditions are properly stated.
• Founders often get caught by verbal promises, vague timelines, early spending, and assumptions that the later contract will fix everything.
• A careful review can help you preserve leverage, reduce wasted cost, and avoid signing into obligations you did not expect.

If you want help with binding clause checks, exclusivity terms, confidentiality wording, and negotiation points before signature, you can reach us on 08081347754 or team@sprintlaw.co.uk for a free, no-obligations chat.