1. Features of a Contract Pacta sunt Servanda – “agreements must be kept”
Legally binding agreement
Does not have to be in writing; one exception being contracts to sell land
Can be in writing, oral or inferred by conduct
Bi-lateral or lateral

2. Types of contracts
Can be classified into 3 types: business, consumer or private
Can be defined according to subject matter: e.g., Sale of goods, Tenancies, Services, Employment
Can be classified according to the way they are concluded: orally, in writing, by conduct

3. Freedom to contract (1)
“…if there is one thing more than another that public policy requires, is that men of full age and competent understanding shall have the utmost liberty in contracting, and that their contracts, when entered into freely and voluntarily, shall be held sacred and shall be enforced by the Courts of Justice”
Sir George Jessel in Printing and Numerical Registering Co. v Sampson (1875)

4. Freedom to contract (2)
However, pure and unrestricted freedom to contract has recently been restricted by the Courts because of the inequality of bargaining power by some parties.
Especially necessary for consumers, employees and tenants

5. Unilateral v Bilateral Contracts
Unilateral – Promise for an Act
Carlill v Carbolic Smoke Ball Co [1893] 1 QB 256
Bilateral – Promise for a Promise

6. Requirements for a valid contract (1)
Offer
Acceptance
Intention
Consideration
All MUST be present for the contract to be valid
Other requirements:
Capacity
Free Consent
Certainty of object
Possibility of performance

7. Requirements for a valid contract (2)
If the requirements are missing the contract can be:
Void – Was never valid (void ab initio)
Voidable – Binds one party; valid until the other party chooses to rescind

8. Offer
A proposition made by one party to another on terms that are fixed or capable of being fixed, with the intention that it will be binding when accepted by the other person.
“Do you want to buy my watch?”

9. Invitation to Treat Fisher v Bell 1961
The stage of a transaction where one party invites the other to make an offer
Partridge v Crittenden (1968)
The defendant placed an advert in a classified section of a magazine offering some bramble finches for sale

11. Engagement Ring Law
According to the UK’s Law Reform (Miscellaneous Provisions) Act Section 3(2); “The gift of an engagement ring shall be presumed to be an absolute gift; this presumption may be rebutted by proving that the ring was given on the condition, express or implied, that it should be returned if the marriage did not take place for any reason.” In other words, the engagement ring is a gift and the ring-receiver is not obliged to return it. 

12. Nature of Agreement
Courts will take an objective approach to contracts – Reasonableness test
Two exceptions:
One party knows that the other party has made a mistake in the terms of the agreement – Hartog v Colin and Shields [1939]: 10c per lb instead of 10c per skin
One party should have known that the other party made a mistake – Scriven Brothers v Hindley ; Centrovincial Estates v Merchant Investors Assurance Ltd. [1983]

13. Auctions Barry v Davies [2000] 1 WLR 1962
An auctioneer will make an invitation to treat, and bidders will make offers of what they are willing to pay. The auctioneer will then accept an offer and a contract is formed. There is, however, in cases not involving a reserve price, an obligation by the auctioneer to sell to the highest bidder. This obligation arises from a collateral contract between the auctioneer and highest bidder under which the auctioneer offered to sell to the highest bidder and the highest bidder accepts

14. Social agreement
A social agreement is an agreement not enforceable by law. E.g.: John makes Jason his best man, so Jason promises to pay for John’s honeymoon. However, the two men had a disagreement at the wedding and Jason now refuses to pay sponsor the honeymoon.