📚 Year 12 WJEC Law: Formulae and Principles Quick Reference | Year 12 WJEC 法律：公式定理速查手册
This quick reference handbook distils the essential rules, principles and key formulae needed for Year 12 WJEC Law. It covers the nature of law, the legal system, criminal law and the law of tort, presenting each core concept as a memorable ‘formula’ where possible. Use this guide alongside your classroom notes and past papers to strengthen your understanding and exam technique.
本速查手册浓缩了 Year 12 WJEC 法律课程必备的核心规则、原则与关键公式。内容涵盖法律性质、法律体系、刑法以及侵权法，并在可能时将每个核心概念表述为易于记忆的“公式”。请将本指南与课堂笔记和历年真题结合使用，以加深你的理解并提升应试技巧。
1. Sources of Law | 法律渊源
The English legal system draws its rules from three main sources: statute law made by Parliament, common law developed by judges, and equity which supplements the common law.
英格兰法律体系主要从三个来源汲取规则：由议会制定的成文法、由法官发展的普通法，以及补充普通法的衡平法。
Equitable maxims act as guiding principles for the courts. ‘He who comes to equity must come with clean hands’ and ‘delay defeats equity’ are two of the most tested maxims in WJEC papers.
衡平法格言是法院遵循的指导原则。“求助于衡平法者自身必须清白”和“迟误使衡平法失效”是 WJEC 试卷中最常考查的两条格言。
The relationship between statute and common law is hierarchical: Parliament is sovereign, meaning statutes can override any judge‑made law. However, judges interpret statutes, giving common law a vital role in shaping the law’s practical impact.
成文法与普通法之间的关系是等级制的：议会拥有主权，这意味着成文法可以推翻任何法官制定的法律。然而，法官负责解释成文法，这使普通法在塑造法律的实际影响方面发挥着至关重要的作用。
2. Rules of Statutory Interpretation | 成文法解释规则
When judges interpret legislation, they apply one or more of four established ‘rules’ – though these are better understood as approaches. Each has a distinct operation and a body of key case law.
法官解释立法时，会运用四种既定“规则”中的一种或多种——尽管将其理解为方法更为恰当。每种规则都有独特的运作方式和一系列关键判例法。
| Rule | Essence | Key Case |
|---|---|---|
| Literal rule | Words given their plain, ordinary dictionary meaning | Whitely v Chappell (1868) |
| Golden rule | Modifies literal rule to avoid absurdity | R v Allen (1872) |
| Mischief rule | Looks at the ‘mischief’ Parliament intended to remedy | Smith v Hughes (1960) |
| Purposive approach | Seeks the overall purpose of the Act, driven by EU influence | Pepper v Hart (1993) |
The literal rule is the starting point, but its rigid application can produce injustice, as in Whitely v Chappell where a dead person was held not to be ‘entitled to vote’. The golden rule steps in where the literal meaning leads to an absurdity or repugnancy. The mischief rule goes further by requiring courts to examine the common law before the Act and identify the defect Parliament sought to cure. The purposive approach is the broadest, requiring judges to interpret legislation in line with its overarching purpose—a method now routinely used in human rights cases.
字面规则是出发点，但其僵硬的适用可能产生不公，正如在 Whitely v Chappell 案中，死人被认定不属于“有权投票者”。黄金规则在字面含义导致荒谬或抵触时介入。除弊规则更进一步，要求法院审查该法制定前的普通法，并识别议会试图弥补的缺陷。目的解释方法最为宽泛，要求法官根据立法的总体目的来解释——这种方法现在被常规地用于人权案件中。
Plain meaning → absurdity? → golden → mischief → purposive
This hierarchy is not rigid, but it helps to visualise how judges move between the rules depending on the clarity and outcome of the literal reading.
这种层级结构并非僵化不变，但它有助于直观地理解法官如何根据字面解读的清晰度和结果在不同规则之间转换。
3. Judicial Precedent | 司法先例
Judicial precedent, or stare decisis, ensures consistency and fairness in the common law system. The decision of a higher court binds all lower courts in the same hierarchy.
司法先例，即“遵循先例”原则，确保了普通法体系的一致性和公平性。上级法院的判决对同一层级体系中的所有下级法院具有约束力。
Ratio decidendi = ruling of law binding in future
The ratio decidendi is the legal reason for the decision – the binding element. Anything said by the judge that is not strictly necessary for the decision is obiter dicta and is merely persuasive. In WJEC answers, you must identify the ratio of a case and explain its precedential value.
ratio decidendi（判决理由）是判决的法律依据，即具有约束力的部分。法官所说的、并非判决所必需的言论属于附随意见，仅具有说服力。在 WJEC 的答案中，你必须识别出判例的判决理由并解释其先例价值。
| Court | Binds | Bound by? |
|---|---|---|
| Supreme Court | All courts below | Its own decisions (normally), not bound by anyone else |
| Court of Appeal | High Court, Crown Court, county courts | Supreme Court; its own decisions (with limited exceptions under Young v Bristol Aeroplane) |
| High Court | Lower courts | Court of Appeal, Supreme Court |
The Supreme Court can depart from its own previous decisions using the Practice Statement 1966, but it does so sparingly. The Court of Appeal’s own binding rule is set out in Young v Bristol Aeroplane Co Ltd (1944), which allows departure only in three narrow circumstances: conflicting previous decisions, an inconsistent Supreme Court ruling, or a decision given per incuriam.
最高法院可以使用《1966年实务声明》背离自己先前的判決，但会谨慎使用。上诉法院自身应受约束的规则在 Young v Bristol Aeroplane Co Ltd (1944) 案中确立，仅允许在三种狭窄情形下背离：先前判決相互冲突、最高法院作出不一致的裁决，或判决系因疏忽而作出。
4. Elements of Criminal Liability | 刑事责任要素
The foundation of virtually every criminal offence can be expressed as a simple equation.
几乎所有刑事犯罪的基础都可以用一个简单的等式来表达。
Actus reus + Mens rea – Defence = Criminal liability
The actus reus is the guilty act, which can be a positive act, an omission (where a duty exists), or a state of affairs. The mens rea is the guilty mind – the mental element required for the crime, such as intention or recklessness.
actus reus（犯罪行为）是违法的行为，可以是作为、不作为（在负有义务的情况下）或状态。 mens rea（犯罪意图）是犯罪的心理要素，例如故意或轻率。
Causation links the act to the result. Two tests must be satisfied: factual causation (the ‘but for’ test from R v White) and legal causation (the act must be the operating and substantial cause, as in R v Smith). An intervening act (novus actus interveniens) may break the chain of causation, but only if it is sufficiently independent and unforeseeable.
因果关系将行为与结果联系起来。必须满足两项检验：事实因果关系（源自 R v White 的“若无则不”检验）和法律因果关系（该行为必须是起作用的实质原因，如 R v Smith 案）。介入行为可能中断因果链条，但前提是它足够独立且不可预见。
Some offences are strict liability, meaning no mens rea is required for at least part of the actus reus. These often involve regulatory matters (e.g., Callow v Tillstone) and are justified on grounds of public protection.
有些犯罪属于严格责任犯罪，意味着至少对犯罪行为的部分要素不要求犯罪意图。此类犯罪通常涉及监管事项（例如 Callow v Tillstone），并以公众保护为正当理由。
5. Non‑Fatal Offences Against the Person | 非致命人身伤害罪
These offences are arranged in a ladder of seriousness, each with a distinct actus reus and mens rea. A clear formula helps to distinguish them in problem questions.
这些罪名按照严重程度呈阶梯状排列，每项罪名都有独特的犯罪行为和犯罪意图。一个清晰的公式有助于在情景题中区分它们。
Assault = causing apprehension of immediate force (no contact needed)
Assault is committed when the defendant intentionally or recklessly causes the victim to apprehend immediate unlawful force. No touching is required – words alone or even silence can suffice (R v Ireland).
当被告故意或轻率地使被害人担心即将遭受非法暴力，即构成侵犯。不需要实际接触——单凭言语甚至沉默即可构成（R v Ireland）。
Battery = actual infliction of unlawful force
Battery involves any intentional or reckless touching without consent, even if it seems trivial. The actus reus is the application of unlawful force; mens rea is intention or subjective recklessness as to that application.
殴打罪指任何未经同意的故意或轻率的触碰，即使看起来微不足道。犯罪行为是施加非法暴力；犯罪意图是对施加该暴力的故意或主观轻率。
| Offence | Actus reus | Mens rea | Key case |
|---|---|---|---|
| s.47 ABH | Assault/battery causing actual bodily harm | Intention or recklessness as to assault/battery | R v Miller |
| s.20 GBH | Wounding or inflicting grievous bodily harm | ‘Maliciously’ – intention or recklessness as to some harm | R v Savage; DPP v Parmenter |
| s.18 GBH | Wounding or causing GBH | Specific intention to cause GBH + specific intent to resist/prevent arrest (ulterior intent) | R v Belfon |
Note the vital distinction: for s.20 the mens rea can be mere recklessness as to some harm, not necessarily serious harm; for s.18 the prosecution must prove a specific intent to cause serious harm. This ladder structure frequently appears in WJEC scenario questions.
请注意关键区别：对于第20条，犯罪意图可以仅仅是对造成某种伤害的轻率，不一定是严重伤害；而对于第18条，控方必须证明有造成严重伤害的特定故意。这种阶梯式结构经常出现在 WJEC 的情景题中。
6. Property Offences: Theft and Robbery | 财产犯罪：盗窃与抢劫
Theft is defined in s.1 Theft Act 1968 and its elements must all be proved. The classic formula is the sum of five sections.
盗窃罪由《1968年盗窃法》第1条定义，其所有要素都必须得到证明。经典的公式是五个条文的总和。
Theft = s.3 appropriation + s.4 property + s.5 belonging to another + s.2 dishonesty + s.6 intention to permanently deprive
Appropriation means any assumption of the rights of an owner, and can even occur with consent if the consent is vitiated (R v Gomez). Property includes money, personal property, things in action and intangible property. Belonging to another is broad – it covers anyone having possession or control.
“侵占”指任何行使所有者权利的行为，即使得到同意，若同意存在瑕疵也可能构成侵占（R v Gomez）。“财产”包括金钱、动产、权利上的财产和无形财产。“属于他人”范围很广，涵盖了任何拥有或控制该财产的人。
Dishonesty is now tested under the Ivey v Genting Casinos (2017) test, which asks (a) what was the defendant’s actual state of knowledge or belief as to the facts; and (b) was the conduct dishonest by the objective standards of ordinary decent people? Intention to permanently deprive can be inferred from borrowing where the property is returned in a substantially different state.
现在，不诚实性的检验遵循 Ivey v Genting Casinos (2017) 案的标准，该检验要求：（a）被告对事实的实际认知或信念是什么；（b）根据普通正直人的客观标准，该行为是否不诚实？意图永久剥夺可从借用行为中推断出来，例如归还时财产的性质已发生实质性改变。
Robbery = Theft + force or threat of force immediately before or at the time of stealing
Under s.8 Theft Act 1968, robbery is theft aggravated by the use or threat of force. All elements of theft must be present; if any is missing, there can be no robbery. The force must be used in order to steal, not merely at the same time.
根据《1968年盗窃法》第8条，抢劫罪是因使用或威胁使用暴力而加重的盗窃罪。盗窃罪的所有要素都必须具备；如果缺少任何一项，即不构成抢劫。使用暴力必须是为了实施盗窃，而不仅仅是同时发生。
7. General Defences in Criminal Law | 刑法的一般抗辩
A defendant may escape liability even when actus reus and mens rea are proved, if a defence applies. The most frequently tested in Year 12 WJEC are self‑defence, insanity, and intoxication.
即使犯罪行为和犯罪意图得到证明，如果存在抗辩，被告仍可能免除责任。Year 12 WJEC 最常考查的是自我防卫、精神错乱和醉酒。
Self‑defence = honest belief of imminent attack + reasonable force in the circumstances
The defendant must genuinely believe that force is necessary; the belief need not be reasonable, but the more unreasonable it is, the less likely the jury will accept it (R v Williams (Gladstone)). The force used must be reasonable – a question of fact, allowing for the defendant’s perception in the heat of the moment (R v Palmer). Pre‑emptive strikes are permitted if the threat is imminent.
被告必须真诚地相信使用暴力是必要的；该信念不一定合理，但越不合理，陪审团就越不可能接受（R v Williams (Gladstone)）。所使用的暴力必须合理——这是一个事实问题，需考虑被告在紧急情况下的认知（R v Palmer）。如果威胁迫在眉睫，允许先发制人的攻击。
Insanity is a special defence based on the M’Naghten Rules: the defendant must prove, on the balance of probabilities, that at the time of the act they were suffering from a defect of reason caused by a disease of the mind, so that they either did not know the nature and quality of the act or did not know it was wrong. If successful, the verdict is ‘not guilty by reason of insanity’.
精神错乱是一种基于姆纳坦规则的特殊抗辩：被告必须在可能性的权衡下证明，在行为时他们因精神疾病而存在理性缺陷，以至于要么不知道行为的性质和品质，要么不知道行为是错误的。如果抗辩成功，裁决为“因精神错乱而无罪”。
Intoxication is not a defence in itself, but it can be relevant to mens rea. Voluntary intoxication may negative specific intent (s.18 GBH, theft) but is no defence to basic intent crimes (s.20, s.47, battery). Involuntary intoxication is a complete defence if the defendant lacked the requisite mens rea.
醉酒本身并非抗辩理由，但它可能与犯罪意图相关。自愿醉酒可能否定特定故意（第18条重伤、盗窃），但对基本故意犯罪（第20条、第47条、殴打）不得作为抗辩。如果被告因非自愿醉酒而缺乏必要的犯罪意图，则构成完全抗辩。
8. The Tort of Negligence: Duty and Breach | 疏忽侵权：注意义务与违反
Negligence is the largest topic within WJEC Year 12 tort law. The classic formula brings together four essential elements that the claimant must establish on the balance of probabilities.
疏忽是 WJEC Year 12 侵权法中篇幅最大的主题。经典的公式汇集了原告必须在可能性权衡下证明的四个基本要素。
Negligence = Duty of care + Breach of duty + Causation + Damage
A duty of care is tested using the three‑stage Caparo test: (1) Was the harm reasonably foreseeable? (2) Was there sufficient proximity? (3) Is it fair, just and reasonable to impose a duty? In established categories such as road user to road user, or employer to employee, a duty is already recognised and a detailed Caparo analysis is unnecessary.
注意义务的检验采用Caparo三步检验法：(1) 损害是否可合理预见？(2) 是否存在充分的近因关系？(3) 施加注意义务是否公平、公正且合理？在已确立的类别中，如道路使用者与道路使用者之间、雇主与雇员之间，注意义务已被认可，无需进行详细的 Caparo 分析。
Breach of duty asks: did the defendant fall below the standard of the reasonable person in the same position? The standard is objective, but can be adjusted for special skills (the professional standard in Bolam), learners (Nettleship v Weston) and children. The court considers four risk factors: likelihood of harm, seriousness of potential harm, cost and practicality of precautions, and social utility of the defendant’s conduct.
违反注意义务的问题是：被告的行为是否低于同等情境下理性人的标准？该标准是客观的，但可以因特殊技能（Bolam案中的专业标准）、学习者（Nettleship v Weston）和儿童而有所调整。法院会考虑四项风险因素：伤害发生的可能性、潜在伤害的严重性、预防措施的成本与可行性，以及被告行为的社会效用。
Breach = falling below objective standard measured by risk factors
9. Causation and Damage in Negligence | 疏忽中的因果关系与损害
Once duty and breach are proved, the claimant must show that the breach caused the damage, both factually and legally. The damage must be of a type recognised by the law and not too remote.
证明注意义务和违反后，原告必须证明该违反行为在事实上和法律上造成了损害。损害必须是法律所承认的类型且不能过于遥远。
Causation = ‘But for’ test (factual) + legal causation (no novus actus)
The factual test comes from Barnett v Chelsea and Kensington HMC: but for the defendant’s breach, would the claimant still have suffered the loss at that time? Legal causation requires that the defendant’s breach be a more than trivial cause of the damage. Multiple causes do not defeat liability as long as the breach materially contributed to the harm (Bonnington Castings v Wardlaw).
事实检验源自 Barnett v Chelsea and Kensington HMC案：若无被告的违反行为，原告是否仍会在当时遭受该损失？法律因果关系要求被告的违反行为是造成损害的一个超出微不足道的原因。只要违反行为对损害有实质性贡献，即使有多个原因也不免除责任（Bonnington Castings v Wardlaw）。
Remoteness of damage is governed by the rule in The Wagon Mound (No 1): the defendant is liable only for damage that was reasonably foreseeable. If the type of damage was unforeseeable, even if the mechanism was unusual, the claim fails. The thin skull rule is an exception: the defendant must take the victim as they find them.
损害的遥远性受 The Wagon Mound (No 1) 规则约束：被告仅对可合理预见的损害负责。如果损害的类型不可预见，即使其发生方式不寻常，索赔也将失败。薄颅骨规则是一项例外：被告必须接受被害人的现有体质。
Common defences in negligence include contributory negligence, where the claimant’s own carelessness contributed to their harm and damages are reduced proportionally (Law Reform (Contributory Negligence) Act 1945), and consent (volenti non fit injuria), which requires full knowledge and voluntary acceptance of the risk.
疏忽的常见抗辩包括共同过失——原告自身的疏忽对其损害有促成作用，从而按比例减少赔偿（《1945年法律改革（共同过失）法》），以及同意（volenti non fit injuria），这要求对风险有充分了解并自愿接受。
10. Contract Law: Offer, Acceptance and Consideration | 合同法：要约、承诺与对价
Although WJEC Year 12 law may emphasise criminal and tort topics, contract formation is sometimes introduced. The foundational equation for a binding contract is straightforward.
尽管 WJEC Year 12 法律可能侧重于刑法和侵权法主题，但有时也会介绍合同成立的内容。一项有约束力的合同的基础等式十分简明。
Contract = Offer + Acceptance + Consideration + Intention to create legal relations
An offer is an expression of willingness to contract on certain terms, made with the intention that it will become binding upon acceptance. It must be distinguished from an invitation to treat, which is merely an invitation to make an offer (Fisher v Bell; Pharmaceutical Society of GB v Boots). Acceptance must be a mirror image of the offer and communicated to the offeror, except where the postal rule applies.
要约是愿意按特定条款订立合同的意思表示，并且带有一旦被承诺即受约束的意图。必须将要约与要约邀请区分开来，后者仅仅是邀请对方发出要约（Fisher v Bell; Pharmaceutical Society of GB v Boots）。承诺必须与要约完全一致，并传达给要约人，除非适用邮寄规则。
Consideration is the price for which the promise is bought – it can be a benefit to the promisor or a detriment to the promisee, but it must be sufficient, not necessarily adequate. Past consideration is generally not good consideration unless a prior request can be implied (Lampleigh v Brathwait).
对价是购买允诺所付出的代价——它可以是允诺人获得的利益或受允诺人遭受的损害，但必须充分，而不一定等值。过去的对价通常不构成有效对价，除非能够推定存在事先的请求（Lampleigh v Brathwait）。
Intention to create legal relations is presumed in commercial agreements but rebutted in social and domestic arrangements, though the presumption can be displaced by evidence. This element ensures that courts do not enforce informal promises made between friends or family members unless clear intent to be legally bound is shown.
创设法律关系的意图在商业协议中被推定存在，但在社交和家庭安排中被推翻，尽管这一推定可以被证据推翻。这一要素确保法院不会强制执行朋友或家庭成员之间的非正式允诺，除非显示出受法律约束的明确意图。
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