Terms — express and implied

Once formation has been established—through offer, acceptance, intention and consideration—the court's task is to determine the content of the contract: the terms that bind the parties. This note examines how English law ascertains and classifies those terms, addressing both those expressly agreed and those the law implies into the bargain.

An express term is one the parties have articulated, whether orally, in writing, or by conduct. Where the parties have reduced their agreement to writing, the court's starting-point is the written instrument, construed in accordance with modern principles of interpretation. But not every pre-contractual statement is a term; some are mere representations, giving rise (if false) to a claim in misrepresentation rather than breach of contract. The distinction turns on the maker's intention, objectively determined, to undertake contractual liability for the truth of the statement.

Implied terms fall into two principal categories. Terms implied in fact are unspoken obligations the court reads into a particular contract because they give effect to the parties' presumed intention; they fill gaps where the agreement is incomplete. Terms implied in law (sometimes called 'legal incidents') inhere in defined categories of contract—employment, landlord and tenant, sale of goods—and exist irrespective of the parties' actual intention, reflecting the law's normative judgment about the proper allocation of risk and obligation.

A third strand is terms implied by custom or trade usage, which occupy a grey zone between fact and law and rest on proof of a settled and notorious practice that the parties are deemed to have contracted with in mind.

Finally, statute has intervened extensively in the twentieth and twenty-first centuries to imply mandatory terms (especially in consumer transactions) and to regulate the incorporation and effect of exclusion clauses. This statutory overlay now stands alongside—and in places displaces—the common law of terms.

This note proceeds as follows: first, the historical evolution of the doctrines; second, the key common-law principles governing express and implied terms; third, the statutory framework (principally the Sale of Goods Act 1979, the Supply of Goods and Services Act 1982, and the Consumer Rights Act 2015); fourth, the landmark authorities; fifth, doctrinal refinements and points of controversy; sixth, scholarly debates; and finally, worked examples and advice for examinations.

The common law's approach to contractual terms has evolved markedly since the nineteenth century. Early Victorian courts took a highly literalist approach: the instrument—if written—was the sole repository of the parties' obligations. The parol evidence rule, crystallised in cases such as Goss v Lord Nugent (1833) 5 B & Ad 58, forbade the admission of extrinsic evidence to add to, vary or contradict the written terms. This rigidity reflected a broader commitment to freedom of contract and party autonomy; if the parties had chosen to embody their bargain in writing, the law would hold them to it.

By the early twentieth century, judges began to soften this stance. The growth of complex commercial relationships exposed the fiction that every contingency could be anticipated and reduced to writing. Courts recognised an inherent incompleteness in most agreements. Lord Justice MacKinnon's remark in Shirlaw v Southern Foundries (1926) Ltd [1939] 2 KB 206 (CA), that a term might be implied if it were 'so obvious that it goes without saying', marks a watershed: implication moved from rare exception to routine tool.

Statutory intervention accelerated in the mid-twentieth century. The Sale of Goods Act 1893 (consolidating earlier Victorian statutes) codified implied terms about title, description, quality and fitness in sales contracts, reflecting legislative concern that laissez-faire bargaining left consumers and weaker parties unprotected. The Unfair Contract Terms Act 1977 introduced sweeping controls on exclusion clauses. More recently, the Consumer Rights Act 2015 has re-cast the statutory regime for consumer contracts, separating out consumer and business-to-business transactions and affording consumers enhanced protection.

The modern law of implied terms also bears the imprint of economic and sociological thinking. Scholars influenced by relational contract theory (Ian Macneil, Hugh Collins) have argued that long-term, co‑operative relationships require more than literalist enforcement of express words; they demand recognition of obligations of good faith, co‑operation and information-sharing. English courts have resisted a general duty of good faith but have nonetheless expanded the categories of implied terms—most prominently in employment contracts (Malik v BCCI [1998] AC 20)—in ways that acknowledge the relational dimension of contracting.

The parol evidence rule itself has been substantially eroded. The House of Lords in Prenn v Simmonds [1971] 1 WLR 1381 and Investors Compensation Scheme Ltd v West Bromwich Building Society [1998] 1 WLR 896 sanctioned recourse to the 'factual matrix'—the background knowledge reasonably available to the parties—when construing written contracts. Contextual interpretation is now routine, though the terms themselves must appear in (or be incorporated into) the contract; extrinsic evidence is used to interpret words, not to add to them.

Express terms and their incorporation

An express term is any provision the parties have, by words or conduct, agreed shall govern their relationship. The principal question is one of incorporation: did the term become part of the contract?

Where the contract is wholly oral, incorporation is straightforward in theory but may be disputed in fact. Parol evidence of what was said is admissible; disputes turn on credibility and inference.

Where the contract is in writing, or partly written and partly oral, the court must decide whether a written document (or clause within it) was incorporated. The orthodox test is whether reasonable notice of the term was given before or at the time of contract, and whether the document in question was one that a reasonable person would expect to contain contractual terms (Parker v South Eastern Railway (1877) 2 CPD 416; Chapelton v Barry UDC [1940] 1 KB 532). The modern tendency is to insist on strict proof of incorporation for onerous or unusual clauses (Interfoto Picture Library Ltd v Stiletto Visual Programmes Ltd [1989] QB 433), especially in consumer contexts.

Once incorporated, a written term will be construed in accordance with the principles of contractual interpretation set out by Lord Hoffmann in Investors Compensation Scheme. The court's task is to ascertain the objective meaning that the language would convey to a reasonable person with knowledge of the factual matrix. The inquiry is iterative, not linear: text and context inform each other. Business common sense matters but cannot override clear language.

Terms versus representations

A pre-contractual statement may be a term (breach of which sounds in contract) or a mere representation (breach of which, if fraudulent or negligent, may give rise to rescission or damages in tort or under the Misrepresentation Act 1967, but not to an action for breach of contract). The distinction is one of intention, ascertained objectively. Relevant factors include:

• The importance attached to the statement by the recipient (Bannerman v White (1861) 10 CBNS 844).
• Whether the maker invited reliance or assumed responsibility for accuracy.
• The timing: a statement made at the moment of contracting is more likely to be a term.
• Reduction to writing: if the statement appears in the written contract, it is presumptively a term; if omitted despite the contract being in writing, that militates against term status (Routledge v McKay [1954] 1 WLR 615).
• Special knowledge: where the maker possesses expertise, courts are readier to classify the statement as a term (Dick Bentley Productions Ltd v Harold Smith (Motors) Ltd [1965] 1 WLR 623; contrast Oscar Chess Ltd v Williams [1957] 1 WLR 370).

Classification of terms: conditions, warranties and innominate terms

Several authorities have proved foundational to the development of the law on express and implied terms.

The Moorcock (1889) established the business efficacy test for implication in fact, holding that a term would be implied if necessary to make the contract work commercially. The case involved a jetty owner who impliedly promised that the river bed was safe; without such a term, the contract to allow the ship to moor would be pointless.

Shirlaw v Southern Foundries (1939) contributed the officious bystander test. MacKinnon LJ's celebrated dictum—that a term implied in fact must be so obvious that 'it goes without saying'—has been cited ever since. The case concerned a managing director's employment contract that was silent on termination; the court had to decide whether an implied term prevented the company from altering its articles so as to remove him.

Hong Kong Fir Shipping (1962) revolutionised the classification of terms by recognising the innominate term. A time charterer sought to repudiate when the vessel's engines broke down repeatedly; the Court of Appeal held that seaworthiness was not a condition and that the breaches, though serious, had not deprived the charterer of substantially the whole benefit. Diplock LJ's judgment remains the locus classicus.

Liverpool City Council v Irwin [1977] AC 239 clarified the difference between implication in fact and in law. Tenants in a tower block claimed the landlord was bound to keep common parts (lifts, stairs, rubbish chutes) in repair. The House of Lords held that the term was implied by law into all tenancy agreements of this nature, as necessary to make the relationship work, but its content was limited to an obligation to take reasonable care—not an absolute duty. Lord Wilberforce's judgment distinguishes between terms 'necessary' as a matter of law and those necessary to give efficacy to a particular contract.

Investors Compensation Scheme v West Bromwich Building Society (1998) reset the law of contractual interpretation. Lord Hoffmann's famous five principles permit wide recourse to the factual matrix but insist that the meaning must be what the words would convey to a reasonable observer; judges may not rewrite contracts on grounds of fairness. The case has had an enormous influence on how express terms are construed.

Marks and Spencer v BNP Paribas (2015) synthesised and tightened the tests for implication in fact. The Supreme Court, per Lord Neuberger, rejected an attempt to imply a term permitting early termination of a lease with repayment of rent paid in advance. The judgment emphasised that implication is exceptional, demanding necessity not reasonableness, and clarity not vagueness. It remains the leading modern authority.

Malik v Bank of Credit and Commerce International SA [1998] AC 20 (also known as Mahmud) recognised an implied term of mutual trust and confidence in employment contracts. When BCCI collapsed amid fraud, former employees claimed stigma damages, arguing the bank's corruption had handicapped their future employability. The House of Lords accepted that the employer's implied duty not to conduct itself in a manner likely to destroy the relationship of trust and confidence had been breached. The decision has since been treated as establishing a term implied by law in all employment contracts, with far-reaching consequences for wrongful and unfair dismissal.

Attorney General of Belize v Belize Telecom Ltd [2009] UKPC 10 offered a restatement of implication by Lord Hoffmann that appeared to merge implication with interpretation: implying a term was simply a matter of construing the contract in context. The dictum was influential but has since been doubted and confined. In Marks and Spencer, Lord Neuberger cautioned that implication remains a distinct exercise; it is not interpretation but a supplement to the express terms, requiring a stricter standard of necessity.

See practice questions below.

See further reading below.