An update
Magnetic Shields Ltd v Vacuum and Atmosphere Services Ltd [2024] EWHC 2260 (TCC)
Tullow Ghana Ltd v Vallourec Oil and Gas France SAS [2025] EWHC 3059 (Comm)
What is the “battle of the forms”?
The expression “battle of the forms” refers to a dispute between two parties as to whose standard terms and conditions are incorporated into the contract between them. It typically occurs when party A offers to buy goods from party B on A’s standard terms and B says that it accepts the offer on the basis of its own standard terms. In this situation, the battle is often won by the party who fired the “last shot”, that is, the last party to put forward terms and conditions that were not explicitly rejected by the recipient. However, this will not always follow, and many cases involve a surprisingly formalistic approach to establish the point at which a contract has been formed (often to the surprise of the parties to it).
This note examines the old “chestnut” in the light, or perhaps shade, thrown by two recent cases.
First, some context.
Take a simple example, which happens very frequently in commerce.
A customer submits an order on its standard purchase order form, which is stated to be subject to its standard terms and conditions of purchase. These will have been drawn up by its lawyers (or these days using AI tools!) and will contain terms which strongly favour the buyer, for example variation rights, wide-ranging warranties of condition or quality, indemnities, flexible cancellation etc.
The supplier issues an acceptance on its standard sales order form, which is stated to be subject to its own standard terms of sale. Similarly, these will contain terms which strongly favour the seller, for example limitation of liability, restrictions of warranty, exclusion of set-off, force majeure etc.
What happens next can vary enormously depending on the alertness of buyer or seller, or their procurement teams, and also the possible existence of other documents containing or referring to terms and conditions such as websites, quotations and estimates, letters of intent, tender documents, framework agreements, acceptance forms, delivery notes and so on.
In one famous case (British Road Services Ltd v Arthur V. Crutchley & Co Ltd [1968] 1 Lloyd's Rep 271) the fate of thousands of bottles of whisky turned on the stamp on a delivery note by a warehouseman late at night, with wording to the effect that the goods were received subject to the warehouse's standard conditions. The goods were later stolen, and a dispute arose as to whose terms applied. By leaving the goods at the warehouse after the stamp had been applied, the carrier accepted that counter-offer by conduct. The warehouse's terms therefore won the battle.
By definition, if a case gets all the way to court then there will have been a mess, where there is uncertainty over which terms or forms should prevail, and thousands or millions of pounds in damages riding on the outcome.
To understand what follows we need to make a quick diversion into the English law of contract, developed by the courts over many centuries. The key requirements for a binding contract are offer and acceptance. A binding contract is only made when an offeror (usually the customer) makes an offer which is clearly accepted by the offeree (usually the supplier), and the other formal requirements such as an intention to contract and certainty of terms are met.
Ok, let’s try and apply the law to the example given above.
The customer's order on its standard purchasing terms is an offer.
The supplier’s supposed acceptance is actually a counter-offer. This is because, to be effective, an acceptance must amount to clear and unambiguous consent. Instead, by proposing different terms of its own, the supplier is actually rejecting the customer's order and making a new counter-offer to the customer.
This is then open to acceptance or rejection, and further counter-offers and so on.
How do the courts unpick this conundrum?
There are various possible outcomes.
The first is a variation on the childhood game of last tap. The court says that the last set of terms sent or referred to in the documents exchanged before the contract is performed will prevail. The sending of this last set of terms is sometimes referred to as the "last shot" fired in the battle of the forms. It wins when no further shots are fired.
The second is that the court finds that there were some other terms which are strong enough to displace the last shot. That might, for instance, be evidenced by a long-established course of dealing or a framework agreement which overrides later attempts to vary specific contracts which are called down from it.
The third is that the court could find that a contract has already been concluded at an earlier point in the dealings, such that later communications containing different and conflicting terms have no effect. In effect, so much mere post-contractual noise after the event.
The fourth is that the court finds that neither party has succeeded in incorporating its terms, for instance reference to terms and conditions which have never in fact been sent, or an email attachment containing only the front page of a purchase order, when the terms and conditions were printed on the reverse. The court might then be able to imply terms on normal principles to give effect to the contract (for example, to reflect the parties' intentions or based on previous dealings).
The fifth is that, in some rare cases, the court says, “a plague on both your houses” and may even find that no contract has been formed at all because there was no objectively ascertainable agreement on essential terms. Even performance may not always resolve the issue, although in many commercial cases it will make it more likely that the court finds a contract existed and then determines its terms.
The trick is to know which category you fall into. That is not always easy, as two recent cases demonstrate.
The 2024 case of Magnetic Shields Ltd v Vacuum and Atmosphere Services Ltd
While not primarily a battle of the forms case, the 2024 case of Magnetic Shields Ltd v Vacuum and Atmosphere Services Ltd contains an important discussion of contract formation and incorporation of standard terms.
Vacuum and Atmosphere Services Ltd ("VAS") provided a quotation for the refurbishment of a vacuum furnace owned by Magnetic Shields Ltd ("MSL"). MSL then issued a purchase order. MSL’s purchase order made an operative reference to its standard terms, which the court held was sufficient to incorporate them; no onerous or unusual term was in issue. VAS responded by a series of emails and later relied on its own contractual terms.
The court held that MSL's purchase order constituted the relevant offer. VAS accepted that offer through the second of three emails sent in response. A binding contract was therefore formed at that point. Any later attempt by VAS to introduce its own terms came too late because the contract already existed.
The key lesson is that the court focused on ordinary offer and acceptance analysis, rather than mechanically applying the traditional "last shot" doctrine. Magnetic Shields demonstrates that the last-shot rule only matters if no contract has already been formed.
Do not assume later invoices or emails can introduce new terms once the contract has already been formed.
Tullow Ghana Ltd v Vallourec Oil and Gas France
The 2025 case of Tullow Ghana Ltd v Vallourec Oil and Gas France is another interesting case on battle of the forms and contract formation. Tullow issued a purchase order incorporating its own standard terms. Vallourec returned the purchase order signed, together with correspondence about the contract, and purported to add its own terms and conditions. Vallourec argued that its response was a counter-offer and that its own terms had been incorporated.
The court decided a contract was concluded when Vallourec returned the signed purchase order. On the facts as found, Vallourec's response amounted to an unconditional acceptance, not a counter-offer. Although Vallourec enclosed its own standard terms, those terms were found, following a careful analysis of what was said and done and when, not to have been incorporated into the contract. Therefore, the contract was governed by Tullow's purchase order terms. Again, this was not a standard battle of the forms “last shot” case.
Returning a signed purchase order may amount to unconditional acceptance, even if standard terms are enclosed with the covering correspondence.
Both decisions are useful reminders that the court will first ask when, objectively, the contract was formed and on what terms, before resorting to any shorthand ‘last shot’ analysis. There is more room for an inadvertent slip.
The takeaway from both these recent cases is that sending your own standard terms does not automatically make your response a counter-offer. You may not even get to first base if the court finds that you have accepted the first offer. A signed (or email) acceptance of a purchase order, without an explicit caveat, is highly likely to be treated as acceptance of the purchaser's terms.
The court will examine the substance of the exchanges between the parties, not merely the presence of competing standard terms. The "last shot" doctrine is a fallback principle, not a rule that overrides ordinary contract formation principles.
If the contract was already concluded when one party signed or accepted the other’s purchase order, later attempts to introduce standard terms will usually come too late. The last shot only matters if it is fired before the contract is made.
If you want to avoid becoming the casualty, then focus less on firing the "last shot" and more on identifying exactly when a binding contract comes into existence.
Practical steps to mitigate contract risk
Put your terms forward early and if your quotation is intended to be the contractual offer, say so expressly.
Treat purchase orders as potential landmines and check them carefully to see if they purport to impose the buyer's terms.
Do not rely on terms and conditions on the back of your invoice. The contract may already have been formed, and you will be too late.
If you are not willing to contract on the other party’s terms, use clear language to say so and keep on saying it.
Use framework agreements which properly negotiate the allocation of risk.
Keep clear records of who said what and when.
Finally, and this may well be in the category of “easier said than done”, when there is a contract of significant value, or the potential for a large claim in damages, confront the battle head on and remove or modify the provisions which unfairly allocate risk.
For more information, or for a contract review, contact John Gavan today.
Related Expertise
Disclaimer: This publication is provided by Laytons LLP for informational purposes only. The information contained in this publication should not be construed as legal advice. Any questions or further information regarding the matters discussed in this publication can be directed to your regular contact at Laytons LLP or Laytons’ Commercial team.
