Practical guides for contract review and redline risk.

English law looks at what a reasonable person would understand from the parties' words and conduct. In commercial negotiations, that means WhatsApp messages, emails, electronic signatures, and follow-on performance can matter as much as a formal draft.

Getting the parties wrong is one of the most expensive mistakes in commercial contracting. English law identifies the parties by construing the agreement against the background known to both sides when they signed, so a vague or incorrect name can leave you suing the wrong entity, facing personal liability, or litigating for years before anyone reaches the merits.

Your definitions clause can decide whether you own software or merely licensed it, whether you can terminate for breach, and what an indemnity actually covers. Yet definitions are among the most poorly drafted and most litigated parts of a commercial agreement. English courts read them through a settled interpretation framework, and they will not rewrite a sophisticated bargain to rescue loose wording.

The scope clause is the contract: it defines what is actually being bought and sold, and when it is vague the disputes are brutal. A GBP 200 million government IT case ran for an eight-week trial and saw most of both sides' claims fail - a sprawling fight in which unclear scope, responsibility, performance standards, and acceptance and remedy mechanics all played their part.

Tie an obligation to a triggering event and you have created a condition precedent: until the event happens, the obligation does not exist. English courts enforce that literally. The Supreme Court has now confirmed that if the trigger never occurs, the obligation never becomes due - even where the party relying on that was the one who prevented it.

Your liability clause, not the size of your loss, decides what you can recover. English courts enforce clearly drafted limitation and exclusion clauses that pass the reasonableness test - so a GBP 50,000 research contract once capped a GBP 100 million claim at GBP 1 million, and the court called that perfectly reasonable.

Most lawyers know warranties and representations are different. Fewer know how much rides on the distinction: in one acquisition it was the difference between a few million and the entire purchase price. How you label and draft these assurances - and whether UCTA even applies - decides what you can actually recover when a statement turns out to be untrue.

Indemnities are assumed to beat ordinary damages claims - no remoteness, no duty to mitigate, recovery outside the liability cap. English cases show those advantages exist only if you draft for them. In Learning Curve v Lewis the same facts were worth GBP 5.21 million as a warranty claim but only GBP 783,325 under a narrow indemnity - over six times, decided entirely by the wording.

Every commercial contract has a damages architecture - the liability cap sets the ceiling, the exclusion clause carves out heads of loss, indemnities create standalone payments, and the liquidated damages clause fixes what is payable for specific breaches without proving loss. Treat these as independent clauses and you get gaps or false comfort. They are one integrated system.

English law gives you two parallel ways to end a contract - common law termination for repudiatory breach, and contractual termination rights - and they usually coexist. In Phones 4u v EE, EE terminated under its contractual insolvency clause alone; when it later claimed more than GBP 200 million in loss of bargain, the court held the claim had no real prospect of success. A single choice in the termination notice cost a nine-figure claim.

Commercial terms are worth nothing if you cannot enforce them. The dispute resolution clause decides where, how, and under whose law a dispute is resolved - and three separate choices (governing law, jurisdiction, and arbitration vs litigation) must each be made deliberately. Get them wrong and you face an inconvenient forum, the wrong rules, or an unenforceable judgment.

When performance becomes impossible, illegal, or ruinously expensive, English law offers strikingly little automatic relief. Three mechanisms address changed circumstances - frustration (a narrow common law doctrine), force majeure (purely contractual), and hardship (no general doctrine at all) - and without the right clauses, the party affected bears the risk entirely.

IP clauses decide who owns what a commercial relationship produces. Get them right and each side keeps what it brought and the client gets what it paid for; get them wrong and a contractor walks away with the copyright in your bespoke software, a partner blocks your licensing, or an AI tool generates deliverables nobody legally owns. And choosing English law does not import English IP ownership rules - a trap most standard forms miss.

Your contract has an anti-assignment clause, so you assume your counterparty cannot transfer it. Then a competitor buys 100% of its shares - same legal entity, no assignment, no novation - and the clause does nothing. Assignment, novation, and change of control are three distinct mechanisms on different legal principles, and addressing one while ignoring the others is the most common gap in commercial contracts.

A departing employee copies the customer database; a due-diligence recipient uses your data to fund a hostile bid; a partner feeds your algorithms into its AI training. In each case the NDA either did not exist or did not work. English law protects confidential information through two parallel systems - an equitable duty and the contractual NDA - and getting the drafting wrong can destroy protection rather than merely weaken it.

A payment your contract requires becomes a criminal offence overnight; a counterparty you onboarded last year is acquired by a sanctioned person; a software licence to an overseas engineer turns out to need an export licence. Sanctions and export controls have moved from a niche concern to a board-level commercial risk - they change fast, they reach across borders, and they can override the contract you signed. This guide explains how they bear on commercial contracts under English law and how to allocate the risk in the drafting.

A buyer acquires an overseas target under an English-law share purchase agreement. Two years in, it discovers a warranty was false, with an exposure in the millions - and with days left before the limitation deadline it serves a claim notice. The seller's lawyers reply within hours, attacking the notice, not the merits. Under English law that is not posturing: the notice clause, not the underlying claim, controls the gateway. The clauses traditionally dismissed as 'boilerplate' decide whether a meritorious claim survives, whether an oral side deal binds, whether a notice arrives in time, whether delay forfeits a termination right, whether one illegal provision sinks the contract, and whether an affiliate or lender can enforce protective terms.