Implied Contract Terms
Terms Implied in Fact
Factually Implied Terms
Two tests are used to imply terms in fact: Marks and Spencer plc v BNP Paribas Securities Services Trust Company (Jersey) Ltd  UKSC 72.
The Business Efficacy Test: is the term necessary to give the transaction the business efficacy the parties must have intended? In other words, does the contract lack commercial or practical coherence without the suggested term?
The Officious Bystander Test: if, when the parties were making the contract, an officious bystander had asked them if they intended to include a particular provision, would they have responded ‘of course’ as if it were obvious?
Both tests are an attempt to determine the objective intention of the parties. The courts will not imply a term merely because it is fair, equitable or reasonable to do so. Factors relevant to whether either test is satisfied include:
If a reasonable person in the parties’ position would be unaware of the subject matter of the proposed term, or would not have anticipated it, it is unlikely that either test will be satisfied: Spring v National Amalgamated Stevedores and Dockers Society (no 2)  1 WLR 585.
If the express terms of the contract appear to cover the situation in dispute, this indicates that the parties would not have agreed to additional terms: Trollope & Colls Ltd v North West Metropolitan Regional Hospital  1 WLR 601.
The less clear it is what the contents of the implied term should be, the less likely that either of the two tests are met: Trollope & Colls v North West Metropolitan Regional Hospital  1 WLR 601.
Ease of Agreement
It must be obvious that the parties would have agreed to the term at the time of contracting had they thought of it.
Terms Implied in Law
Legally Implied Terms
Some terms are implied by the operation of law. This might be due to statute, such as the Sale of Goods Act 1979, or the common law. When a term is implied in law, the courts are not seeking to determine the parties’ intention: Liverpool City Council v Irwin  AC 239
The Test for Implying Terms in Law
There are two requirements for a term to be implied in law: El Awadi v Bank of Credit and Commerce International SA  1 All ER 242. Firstly, the contract must be of a ‘defined type’. Secondly, the term must be ‘necessary’.
What is a ‘Defined Type’ of Contract?
The right kind of contract is normally one which is very common and whose terms do not differ much. Examples include:
- Sale of goods contracts;
- Employment contracts;
- Landlord and tenant contracts;
- Banker and customer.
The contract in question must be a ‘normal’ contract of its type rather than a special, customised contract.
When is a Term ‘Necessary’?
The test of necessity asks whether contracts of the relevant type ought to all carry the implied term. This is a wider test than the business efficacy test: Scally v Southern Health and Social Services Board  1 AC 294.
When determining if the term is ‘necessary’, the court may consider whether the term is reasonable, fair and balance competing policy considerations: Crossley v Faithful & Gould Holdings Ltd  EWCA Civ 293. The contemporary social policy behind a particular kind of contract is particularly important. However, the courts will not imply a term in law if the matter is better dealt with by Parliament: Reid v Rush Tompkins Group plc  1 WLR 212.
Terms Implied by Custom
Customary Contract Terms
The final way a term can be implied into a contract is by trade custom. When a term is implied on customary grounds, the courts make a presumption about the parties’ intentions based on that custom: Hutton v Warren (1836) 1 M&W 466.
The Test for Implying Customary Terms
A customary term will only be implied if the practice is clearly established, notorious and reasonable: Cunliffe-Owen v Teather & Greenwood  1 WLR 1421. If this test is met, then it is presumed that the parties intended to include the term in their contract.
A term is notorious if it is ‘so well known in the [relevant] market…that those who conduct business in [that] market contract with the usage as an implied term’: Cunliffe-Owen v Teather & Greenwood  1 WLR 1421. This essentially requires ‘evidence of a universal and acknowledged practice of the market’: Baker v Black Sea & Baltic General Insurance Co Ltd  1 WLR 97.
Rebutting the Presumption of a Customary Term
The presumption in favour of the customary term can only be rebutted if it is contradicted by express terms or terms implied in fact or law, or is ‘inconsistent with the tenor’ of the contract: London Export Corporation v Jubilee Coffee Roasting Co Ltd  1 WLR 271.