Contract Formation

Contract formation is all about understanding when agreements become legally binding. Think of it like the difference between promising your mate you'll lend them a fiver versus signing a mobile phone contract - both are agreements, but only one will land you in court if you break it.

The law recognises that not every promise should be enforceable, otherwise we'd all be constantly suing each other over casual remarks. That's why contracts need specific elements to be valid: intention to create legal relations, agreement (offer and acceptance), and consideration.

💡 Quick Tip: A contract is simply "an agreement which is binding in law" - one that courts will actually enforce if things go wrong.

Intention to Create Legal Relations

The courts need to know you actually meant business when making your agreement. They look at this objectively - what would a reasonable person think based on the circumstances?

Business agreements have a strong presumption of legal intention. In Edwards v Skyways, even when a company called a payment "ex gratia" (meaning no legal obligation), the court still found they intended to be legally bound. Similarly, competitions and promotions are usually binding - you can't just refuse to give someone their prize.

However, you can rebut this presumption with very clear wording. In Jones v Vernon's Pool, the phrase "binding in honour only" was enough to show no legal intention existed.

Social and domestic agreements work the opposite way - there's a presumption of no legal intention. Balfour v Balfour shows that casual promises between married couples living together aren't usually binding. But when couples separate, like in Merrit v Merrit, agreements about maintenance become legally enforceable.

💡 Remember: The more formal and commercial the setting, the more likely courts will find legal intention existed.

Agreement: Offers vs Invitations to Treat

Understanding the difference between an offer and an invitation to treat is crucial - you can only accept actual offers. An offer must be definite and certain, showing real willingness to be bound by specific terms.

Most shop displays and advertisements are just invitations to treat, not offers. In Partridge v Crittenden, an advert for birds wasn't an actual offer to sell. This protects businesses from being overwhelmed with acceptances.

The exception is unilateral contracts, where offers are made "to the world." The famous Carlill v Carbolic Smoke Ball case shows how advertisements can become binding offers when they promise rewards for specific actions.

Bilateral contracts involve known parties exchanging promises, whilst unilateral contracts only require performance of the requested act - no need to communicate acceptance beforehand.

💡 Key Point: If someone hasn't definitively committed to specific terms, they're probably just inviting you to make an offer, not making one themselves.

Ending Offers and Acceptance Rules

Offers don't last forever - they can end through revocation (withdrawal), rejection, counter-offers, or lapse of time. In Hyde v Wrench, a counter-offer killed the original offer completely, so you can't go back to it later.

Acceptance must be unqualified - no "ifs" or "buts" allowed. It also must be communicated to the offeror, and silence never counts as acceptance (Felthouse v Bindley).

The postal rule is a quirky exception: acceptance by post happens when you post the letter, not when it arrives. This protects people from offers being revoked whilst letters are in transit (Adams v Lindsell). However, this only applies when post is the expected method of communication.

For electronic communications, acceptance usually occurs when received and when the recipient would reasonably be expected to read it - not necessarily when they actually do read it.

💡 Pro Tip: Always check if specific methods of acceptance are required - failing to follow them exactly can invalidate your acceptance.

Consideration: The Price of Promises

Consideration is what makes a contract different from a gift - both parties must give something of value. It's about exchange, whether that's money, goods, services, or even promises for future performance.

The key rule is that consideration must be sufficient (have some legal value) but needn't be adequate (equal in value). In Thomas v Thomas, £1 rent per year was enough, even though it wasn't fair market value.

Emotional promises don't count as consideration. White v Bluett shows that promising to stop complaining isn't sufficient, whilst Ward v Bytham demonstrates that promising happiness can be sufficient if there's no existing legal duty to provide it.

Past consideration - doing something before the other party makes their promise - usually isn't sufficient. The work in Re McArdle was done before any promise of payment, so no contract existed.

💡 Remember: Courts care about whether consideration exists, not whether it's a good deal - that's your responsibility to negotiate.

Existing Duties and Privity

Doing what you're already contractually obliged to do isn't normally sufficient consideration. In Stilk v Myrick, sailors couldn't claim extra wages for doing work they'd already agreed to do in emergencies.

However, the modern approach in Williams v Roffey shows that if providing something extra gives the other party a practical benefit, it can be sufficient consideration - even without additional contractual duties.

Privity of contract means only parties to a contract can enforce it. In Beswick v Beswick, the aunt couldn't claim payments promised to her because she wasn't party to the original agreement.

Key exceptions include group bookings (Jackson v Horizon Holidays), agency relationships, collateral contracts, and restrictive covenants on land. The Contracts (Rights of Third Parties) Act 1999 also allows third parties to enforce contracts that expressly benefit them.

💡 Important: Even if a contract is made for your benefit, you usually can't enforce it unless you're actually named as a party or fall within specific exceptions.