For instance, in 1317 one Simon de Rattlesdene alleged he was sold a tun of wine that was contaminated with salt water and, quite fictitiously, this was said to be done "with force and arms, namely with swords and bows and arrows".
Increasingly, the English law on contractual bargains was affected by its trading relations with northern Europe, particularly since Magna Carta had guaranteed merchants "safe and secure" exit and entry to England "for buying and selling by the ancient rights and customs, quit from all evil tolls".
[15] Around the same time the Common Pleas indicated a different limit for contract enforcement in Bret v JS,[16] that "natural affection of itself is not a sufficient consideration to ground an assumpsit" and there had to be some "express quid pro quo".
"[25] The same year, the Judicature Act 1875 merged the Courts of Chancery and common law, with equitable principles (such as estoppel, undue influence, rescission for misrepresentation and fiduciary duties or disclosure requirements in some transactions) always taking precedence.
[26] The essential principles of English contract law, however, remained stable and familiar, as an offer for certain terms, mirrored by an acceptance, supported by consideration, and free from duress, undue influence or misrepresentation, would generally be enforceable.
Traditionally, English law has viewed the display of goods in a shop, even with a price tag, as an invitation to treat,[44] so that when a customer takes the product to the till it is she who is making the offer, and the shopkeeper may refuse to sell.
[50] Statute imposes criminal penalties for businesses that engage in misleading advertising, or not selling products at the prices they display in store,[51] or unlawfully discriminating against customers on grounds of race, gender, sexuality, disability, belief or age.
Along with a number of other critics,[70] in a series of cases Lord Denning MR proposed that English law ought to abandon its rigid attachment to offer and acceptance in favour of a broader rule, that the parties need to be in substantial agreement on the material points in the contract.
In Butler Machine Tool Co Ltd v Ex-Cell-O Corp Ltd[71] this would have meant that during a "battle of forms" two parties were construed as having material agreement on the buyer's standard terms, and excluding a price variation clause, although the other court members reached the same view on ordinary analysis.
[112] However, in the leading case of Williams v Roffey Bros & Nicholls (Contractors) Ltd,[113] the Court of Appeal held that it would be more ready to construe someone performing essentially what they were bound to do before as giving consideration for the new deal if they conferred a "practical benefit" on the other side.
Since the introduction of legislation regulating unfair terms, English courts have become firmer in their general guiding principle that agreements are construed to give effect to the intentions of the parties from the standpoint of a reasonable person.
[168] Reflecting the modern position since unfair terms legislation was enacted,[169] the most quoted passage in English courts on the canons of interpretation is found in Lord Hoffmann's judgment in ICS Ltd v West Bromwich BS.
For instance, under section 12–14, any contract for sale of goods carries the implied terms that the seller has legal title, that it will match prior descriptions and that it is of satisfactory quality and fit for purpose.
This test derives from Liverpool City Council v Irwin[184] where the House of Lords held that, although fulfilled on the facts of the case, a landlord owes a duty to tenants in a block of flats to keep the common parts in reasonable repair.
In employment contracts, multiple standardized implied terms arise also, even before statute comes into play, for instance to give employees adequate information to make a judgment about how to take advantage of their pension entitlements.
Apart from physical impossibility, frustration could be down to a contract becoming illegal to perform, for instance if war breaks out and the government bans trade to a belligerent country,[218] or perhaps if the whole purpose of an agreement is destroyed by another event, like renting a room to watch a cancelled coronation parade.
[219] But a contract is not frustrated merely because a subsequent event makes the agreement harder to perform than expected, as for instance in Davis Contractors Ltd v Fareham UDC where a builder unfortunately had to spend more time and money doing a job than he would be paid for because of an unforeseen shortage of labour and supplies.
Although it probably would not have been avoidable under the mistake in equity doctrine anyway, Lord Phillips MR held that a rescue company could not escape from an agreement to save a ship because both parties were mistaken that the distressed vessel was further than they originally thought.
[241] By contrast, in Bunge Corporation v Tradax SA[242] the House of Lords held that giving notice for a ship to start loading the soya bean cargo four days late, when the contract expressly stipulated the date, should allow the right to terminate regardless of the actual consequences of the breach.
[254] Sometimes potential profits will be too uncertain, or a general fall in market prices means that even claiming damages for the thing itself would leave one in a negative position, and so the courts allow a claimant to choose whether to sue, not for a failure in expectations, but to cover her expenses in preparing for the contract, or the "reliance interest".
If damages would be an inadequate remedy, for instance, because the subject matter was a unique painting, or a piece of land, or was to deliver petrol during an oil crisis,[259] a court may compel literal or specific performance of the contract's terms.
While Lord Nicholls stated, other than compensatory damages are not an adequate remedy, that "no fixed rules can be prescribed" and their Lordships were eager to not hamper the development of the law, the cases where such awards have been made in contract have all involved some quasi-proprietary element.
However, outside insurance, partnerships, surety, fiduciary relations, company shares, a narrow range of regulated securities,[275] and consumer credit agreements,[276] the duty on negotiating parties to disclose material facts does not extend to most contracts.
A bare majority in the House of Lords held that to protect the certainty of commercial dealings through a signed document, the contract between the finance company and the crook was void (the same consequence as if there had never been any offer mirrored by an acceptance).
[309] One potential exception to this pattern, and now very heavily restricted, is the defence of "non est factum", which originally applied in favour of illiterate people in the 19th century allowed a person to have a signed contract declared void if it is radically different from what was envisaged.
[312] This would have allowed escape from an agreement if without independent advice one person's ability to bargain for better terms had been heavily impaired, and would have essentially given courts broader scope to change contracts to the advantage of weaker parties.
[313] However, in 2020 the Supreme Court of Canada approved Bundy and acknowledged that a general doctrine of unconscionability, based upon unequal bargaining power, was part of Canadian law in Uber Technologies Inc v Heller.
[315] In three main situations, English law allows people who lack legal capacity to contract to escape from enforcement of agreements and recover property that was conveyed, to reverse unjust enrichment.
[333] These have included agreements to overthrow a friendly government,[334] to publish libel,[335] to obstruct bankruptcy proceedings,[336] to procure a knighthood,[337] to violate exchange control regulations,[338] or to defraud the tax authorities.
[370] In the most influential economic theories of a similar time, John Stuart Mill argued that while laissez faire should be the general rule, there were major exceptions covering consumers, any long-term contract, the governance of large organizations, employment relations, and for insuring people's welfare.