📚 IGCSE OCR Law: Key Rules & Principles Quick Reference | IGCSE OCR 法律：关键规则与原理速查手册
This quick reference guide distils the essential rules, legal principles and landmark cases you need to master for the IGCSE OCR Law examination. Think of each point as a "formula" – a reliable framework you can apply to scenario questions. From the elements of a crime to the formation of a contract, these building blocks will help you structure your answers with precision.
本速查手册提炼了IGCSE OCR法律考试必须掌握的核心规则、法律原理和标志性案例。你可以将每一个要点视为一个“公式”——一套可以套用在情境题中的可靠框架。从犯罪构成要件到合同成立要素，这些基础模块将帮助你精准地组织答案。
1. Elements of Criminal Liability | 刑事责任构成要件
Actus Reus + Mens Rea + (No Defence) = Criminal Liability. Actus reus is the guilty act; it can be an act, an omission where a duty exists, or a state of affairs. Mens rea is the guilty mind, which for most crimes requires intention (direct or oblique) or recklessness (Cunningham). For strict liability offences, no mens rea is required for at least part of the actus reus.
犯罪行为 + 犯罪意图 + (无抗辩事由) = 刑事责任。犯罪行为即犯意行为；可以是作为、存在法律义务的不作为，或者特定状态。犯罪意图即犯意，对大多数犯罪而言要求故意（直接或间接）或轻率（Cunningham标准）。对于严格责任犯罪，至少部分犯罪行为不要求证明犯罪意图。
Direct intent: defendant's aim or purpose (Mohan). Oblique intent: the result was a virtual certainty and the defendant appreciated that (Woollin). Recklessness: defendant foresaw a risk and went on to take it unreasonably (Cunningham). Transferred malice: intent to harm one person transfers to the actual victim (Latimer).
直接故意：被告人的目的或动机（Mohan案）。间接故意：结果几乎是必然发生的，且被告人认识到这一点（Woollin案）。轻率：被告人预见到风险但仍不合理地冒险（Cunningham案）。转移犯意：对一人存有恶意转移至实际受害人（Latimer案）。
2. Homicide – Murder and Voluntary Manslaughter | 杀人罪 – 谋杀与自愿非预谋杀人
Murder: Unlawful killing of a reasonable creature in being under the Queen's/King's Peace with malice aforethought (intention to kill or cause grievous bodily harm). Voluntary Manslaughter arises when a defendant satisfies both actus reus and mens rea for murder but successfully pleads a partial defence: diminished responsibility, loss of control, or suicide pact.
谋杀：在国王/女王治下，非法杀害有理性生命体，且具有恶意预谋（意图杀人或造成严重身体伤害）。自愿非预谋杀人：被告人虽然满足谋杀的犯罪行为和犯罪意图，但成功主张减轻责任、失控或自杀协定等部分抗辩。
Diminished responsibility (s.2 Homicide Act 1957 as amended): abnormality of mental functioning caused by a recognised medical condition, which substantially impaired the defendant's ability to understand the nature of their conduct, form a rational judgment, or exercise self-control. Loss of control (s.54-55 Coroners and Justice Act 2009): defendant's actions resulted from a loss of self-control triggered by a qualifying trigger (fear of serious violence or things said/done of an extremely grave character), and a person of the defendant's sex and age with a normal degree of tolerance would have reacted similarly.
减轻责任（1957年《杀人罪法》第2条经修订）：由公认医疗状况引起的精神功能异常，严重削弱了被告人理解行为性质、形成理性判断或行使自我控制的能力。失控（2009年《验尸官和司法法》第54-55条）：被告人的行为系因失控所致，且有适格触发事由（对严重暴力的恐惧，或具有极端严重性质的事情所言所行），且与被告人同性别、同年龄、具有正常容忍度的人可能作出类似反应。
3. Non-Fatal Offences Against the Person | 非致命人身侵害犯罪
Key ladder of offences under the Offences Against the Person Act 1861 and common law: Assault (causing victim to apprehend immediate unlawful force, no need for physical contact) and Battery (application of unlawful force). Both are common law offences requiring intention or recklessness.
1861年《人身侵害法》和普通法下的主要层级：威胁罪（使被害人恐惧即将遭受非法暴力，无需肢体接触）和殴打罪（实施非法暴力）。两者均为普通法犯罪，要求故意或轻率。
Assault occasioning actual bodily harm (s.47): assault or battery causing actual bodily harm – harm that is more than transient or trifling (Miller). Malicious wounding or inflicting grievous bodily harm (s.20): maliciously wounding or inflicting GBH; 'malice' here means intention or recklessness. Wounding or causing GBH with intent (s.18): requires specific intent to cause GBH or resist/prevent arrest. GBH means really serious harm (DPP v Smith).
威胁致实际身体伤害（第47条）：威胁或殴打造成实际身体伤害——伤害程度超出短暂或轻微（Miller案）。恶意致伤或造成严重身体伤害（第20条）：恶意致伤或造成GBH；此处“恶意”指故意或轻率。 意图致伤或造成GBH（第18条）：要求有造成GBH或抗拒/阻止逮捕的特定故意。GBH指真正严重的伤害（DPP v Smith案）。
4. Property Offences – Theft and Robbery | 财产犯罪 – 盗窃与抢劫
Theft (s.1-6 Theft Act 1968): Dishonest appropriation of property belonging to another with the intention to permanently deprive. All five elements must be proved: appropriation (assuming the rights of the owner, Pitham & Hehl), property (including money, personal and real property, things in action, other intangible property), belonging to another, dishonesty (established by the Ghosh test now largely replaced by Ivey v Genting Casinos: was the conduct dishonest by the standards of ordinary decent people?), and intention to permanently deprive.
盗窃（1968年《盗窃法》第1-6条）：不诚实地挪占他人财产，意图永久剥夺。必须证明五个要素：挪占（行使所有人的权利，Pitham & Hehl案）、财产（包括金钱、动产和不动产、诉讼上的财产、其他无体财产）、属于他人、不诚实（根据Ghosh标准，如今基本上被Ivey v Genting Casinos案取代：按照普通诚实人的标准，该行为是否不诚实？），以及意图永久剥夺。
Robbery (s.8): Theft plus the use or threat of force immediately before or at the time of the theft, and the force must be used in order to steal. The elements of theft must be present; if any is missing, there is no robbery. The force or threat need not be against the victim of the theft (e.g. against a bystander).
抢劫（第8条）：盗窃加上在盗窃即将发生之前或当时使用或威胁使用武力，且武力必须是为了实施盗窃。盗窃的所有要素必须同时存在；若缺失任何一项，则不构成抢劫。武力或威胁不一定针对盗窃的被害人（例如针对旁观者）。
5. Defences in Criminal Law | 刑事法律抗辩事由
Insanity (M'Naghten Rules): Defendant must prove on balance of probabilities that at the time of the act they were labouring under a defect of reason from a disease of the mind, so as not to know the nature and quality of the act, or if they did know, that they did not know it was wrong. Automatism: An act done by the muscles without any control of the mind (e.g. spasm) or an act done by a person who is not conscious of what they are doing – caused by an external factor. Intoxication: Voluntary intoxication is no defence to crimes of basic intent, but may be a defence to crimes of specific intent if it prevented the defendant from forming the required intent. Involuntary intoxication is a defence if the defendant lacked the mens rea.
精神错乱（M'Naghten规则）：被告人须在可能性平衡标准上证明，在行为当时因精神疾病导致理性缺陷，以致不知行为的性质和品质，或者虽知但不知其错误。无意识行为：肌肉行动未受意识控制（如痉挛），或行为者不知自己所为——由外部因素引起。醉酒：自愿醉酒不构成基本意图犯罪的抗辩，但若阻止被告人形成特定故意则可作为特定故意犯罪的抗辩。非自愿醉酒下若被告人缺乏犯意，则成立抗辩。
Self-defence / defence of property: A person may use such force as is reasonable in the circumstances for self-defence or defence of another or property. Force must be necessary and proportionate to the threat as the defendant honestly believed it to be (even if mistaken, provided the mistake was not induced by voluntary intoxication). Duress: Defence to all crimes except murder and treason; the defendant was forced to commit a crime by threat of death or serious personal injury. Threat must be of such gravity that a person of reasonable firmness sharing the defendant's characteristics would have succumbed.
自卫/防卫财产：为自身、他人或财产防卫，可在当时情况下使用合理武力。武力必须相对于被告人诚实相信的威胁而言是必要且相称的（即便存在误认，只要该误认非由自愿醉酒引起）。被迫行为：除谋杀和叛国罪外的一切犯罪抗辩；被告人因死亡或严重人身伤害威胁而被迫犯罪。威胁的严重程度须达到一个与被告人特征相同、具有合理坚定性的人也会屈从的程度。
6. Formation of a Contract | 合同成立
A legally binding contract requires offer + acceptance + consideration + intention to create legal relations + capacity. Offer: A definite promise to be bound on specific terms (Gibson v Manchester City Council – statement of intention not an offer). An invitation to treat is not an offer but an invitation to make an offer (goods on display, Fisher v Bell; advertisements, Partridge v Crittenden). Acceptance: Unconditional agreement to all terms of the offer. The postal rule: acceptance by post takes effect when the letter is posted, not when received (Adams v Lindsell). However, the postal rule will not apply if it was unreasonable to use the post or the offeror excluded it. Acceptance must be communicated; silence cannot constitute acceptance (Felthouse v Bindley).
一项有法律约束力的合同需要要约 + 承诺 + 对价 + 设立法律关系的意图 + 行为能力。要约：以特定条件受约束的明确承诺（Gibson v Manchester City Council案——意向声明不构成要约）。要约邀请并非要约，而是邀请对方发出要约（陈列商品，Fisher v Bell案；广告，Partridge v Crittenden案）。承诺：无条件同意要约的所有条款。投邮规则：邮寄承诺于信件投邮时生效，而非到达时（Adams v Lindsell案）。但若使用邮寄不合理或要约人排除该规则，投邮规则不适用。承诺必须传达；沉默不构成承诺（Felthouse v Bindley案）。
7. Consideration and Intention | 对价与意图
Consideration: Something of value given by each party – "the price of the promise". Rules: consideration must be sufficient but need not be adequate (Chappell v Nestle – chocolate wrappers were good consideration); past consideration is not good consideration (Re McArdle); performance of an existing duty is generally not good consideration unless it goes beyond the duty or provides a practical benefit (Williams v Roffey Bros). Part payment of a debt is not good consideration for a promise to waive the balance (Pinnel's case), unless there is some extra element, or the doctrine of promissory estoppel applies.
对价：每一方提供的具有价值之物——“承诺的价格”。规则：对价必须充足但无需相当（Chappell v Nestle案——巧克力包装纸构成有效对价）；过去的对价不构成有效对价（Re McArdle案）；履行现有义务一般不是有效对价，除非超出义务范围或提供实际利益（Williams v Roffey Bros案）。部分偿还债务不构成免除余额承诺的有效对价（Pinnel案），除非存在额外因素或适用允诺禁反言原则。
Promissory estoppel: If a party makes a clear promise not to enforce their strict legal rights, and the other party relies on that promise and acts to their detriment, the promisor may be prevented from going back on the promise if it would be inequitable (Central London Property Trust v High Trees House). It operates as a shield, not a sword.
允诺禁反言：若一方作出不执行严格法律权利的明确承诺，另一方信赖该承诺并因此受损，若反悔有违公允，则承诺人不得收回承诺（Central London Property Trust v High Trees House案）。该原则具防御功能，不能作为起诉依据。
Intention to create legal relations: In social/domestic agreements, there is a presumption that there is no intention (Balfour v Balfour), rebuttable by clear evidence. In commercial agreements, the presumption is that there is intention, rebuttable by express wording (Rose & Frank v Crompton – "honour clause").
设立法律关系的意图：在社交/家庭协议中，推定不具有此意图（Balfour v Balfour案），可用明确证据推翻。在商业协议中，推定具有意图，可通过明示措辞推翻（Rose & Frank v Crompton案——“荣誉条款”）。
8. Terms and Breach of Contract | 合同条款与违约
Conditions: Major terms going to the root of the contract; breach entitles the innocent party to repudiate the contract and claim damages (Poussard v Spiers). Warranties: Minor terms; breach only entitles the innocent party to damages, not termination (Bettini v Gye). Innominate terms: The remedy depends on the seriousness of the breach – if it deprives the innocent party of substantially the whole benefit, treated as a condition; otherwise as a warranty (Hong Kong Fir Shipping v Kawasaki Kisen Kaisha).
条件条款：触及合同根基的主要条款；违约赋予守约方终止合同并索赔的权利（Poussard v Spiers案）。保证条款：次要条款；违约仅赋予守约方损害赔偿，不能解除合同（Bettini v Gye案）。未名条款：救济取决于违约的严重程度——若剥夺了守约方的几乎全部合同利益，则视为条件条款处理；反之按保证条款处理（香港杉木船务诉川崎汽船案）。
Express terms are those stated by the parties. Implied terms can be implied by statute (e.g. Sale of Goods Act 1979 – satisfactory quality, fitness for purpose) or by the courts (business efficacy test, The Moorcock).
明示条款是双方明确表达的条款。默示条款可由成文法（如1979年《货物买卖法》——品质满意、适合用途）或法院（商业功效标准，The Moorcock案）默示列入。
9. Negligence – Duty, Breach, Damage | 过失侵权 – 义务、违反、损害
To establish negligence, the claimant must prove: duty of care, breach of that duty, and damage caused by the breach (causation and remoteness). Duty of care: Established by the Caparo three-part test – foreseeability of harm, proximity, and whether it is fair, just and reasonable to impose a duty (Caparo Industries v Dickman). In many established relationships, duty is automatically recognised (doctor-patient, driver-other road users).
要成立过失侵权，原告须证明：注意义务、违反该义务、以及因违反造成的损害（因果关系与遥远性）。注意义务：通过Caparo三阶测试确立——损害可预见性、邻接关系、以及施加义务是否公平、公正和合理（Caparo Industries v Dickman案）。在诸多既有关系中，注意义务自动被承认（医患、驾驶员与其他道路使用者）。
Breach: The defendant's conduct fell below the standard of the reasonable man (Blyth v Birmingham Waterworks). Factors include: likelihood of harm, seriousness of harm, cost of taking precautions, and any social utility of the defendant's conduct. Professional standard: the test is the standard of the ordinary competent professional (Bolam test, modified by Bolitho to require a logical basis).
违反义务：被告的行为低于理性人标准（Blyth v Birmingham Waterworks案）。考量因素包括：损害的可能性、损害的严重性、采取防范措施的成本，以及被告行为的社会效益。专业人士标准：以普通合格专业人员的标准为检验（Bolam标准，经Bolitho案修改，要求具备逻辑基础）。
Damage – Causation: Factual causation – the "but for" test (Barnett v Chelsea & Kensington Hospital). Legal causation – the damage must not be too remote. The test for remoteness: was the kind of damage reasonably foreseeable (The Wagon Mound (No 1))? The thin skull rule: the defendant must take the victim as found and cannot escape liability because the victim had an unusual vulnerability.
损害 – 因果关系：事实因果关系——“若无则不”检验（Barnett v Chelsea & Kensington Hospital案）。法律因果关系——损害不能过于遥远。遥远性检验：该类损害是否合理可预见（The Wagon Mound (No 1)案）？薄头骨规则：被告必须接受被害人现状，不得因被害人具有特殊脆弱性而逃避责任。
10. Occupiers' Liability | 占有人责任
Occupiers' Liability Act 1957 covers lawful visitors. Occupier owes a common duty of care to see that the visitor is reasonably safe in using the premises for the purposes for which they are invited or permitted. The duty extends to risks of damage to property. Children must be expected to be less careful (Glasgow Corp v Taylor). An occupier may discharge the duty by giving warnings of the danger.
1957年《占有人责任法》适用于合法访问者。占有人负有一项普通注意义务：确保访问者在被邀请或允许的目的范围内使用房屋时合理安全。该义务涵盖财产损害风险。对于儿童，必须预见到其较缺乏小心（Glasgow Corp v Taylor案）。占有人可通过给出危险警告来履行义务。
Occupiers' Liability Act 1984 covers trespassers (non-visitors). Occupier owes a duty if: (a) they are aware of the danger or have reasonable grounds to believe it exists; (b) they know or have reasonable grounds to believe that someone is in or may come into the vicinity of the danger; (c) the risk is one against which, in all the circumstances, they may reasonably be expected to offer some protection. Duty is to take such care as is reasonable in all the circumstances to see that the trespasser does not suffer injury. Warnings of danger may discharge the duty.
1984年《占有人责任法》适用于侵入者（非访问者）。占有人在以下情形负有责任：(a) 知道或有合理理由相信危险存在；(b) 知道或有合理理由相信有人正在或可能进入危险附近；(c) 该风险属于在所有情形下可合理期待提供某种保护的风险。义务是采取当时情况下合理的注意，确保侵入者不致受伤。危险警告可解除义务。
11. Law Making and the Hierarchy of Courts | 法律制定与法院等级
Parliamentary law-making ading, second reading, committee stage, report stage, third reading in each House) → Royal Assent. Judicial precedent: The doctrine of stare decisis. Ratio decidendi (binding reason for the decision) creates precedent; obiter dicta (remarks in passing) are persuasive. The hierarchy of courts determines which decisions are binding. The Supreme Court is the highest domestic court, binding all below. It is not strictly bound by its own decisions but will generally follow them (Practice Statement 1966). The Court of Appeal is bound by the Supreme Court and normally bound by its own previous decisions with limited exceptions (Young v Bristol Aeroplane).
议会立法：议会法令（成文法）是最高形式的法律。程序：绿皮书（咨询）→ 白皮书（明确建议）→ 法案（每一院：一读、二读、委员会阶段、报告阶段、三读）→ 御准。司法先例：遵循先例原则。判决理由（具有约束力的判决依据）创设先例；附带意见（随口的评述）具有说服力。法院等级决定了哪些判决具有约束力。最高法院是国内最高级别法院，约束所有下级法院。它并不严格受自身判例约束，但通常会遵循（1966年实务声明）。上诉法院受最高法院约束，通常也受自身先前判例约束，仅有限例外（Young v Bristol Aeroplane案）。
Statutory interpretation: Rules of interpretation assist judges. Literal rule: words given their ordinary dictionary meaning. Golden rule: where literal rule leads to absurdity, the court may modify the meaning (R v Allen – 'marry' includes going through the ceremony). Mischief rule: judges look at the gap in the law that the statute was intended to cover and interpret accordingly (Smith v Hughes). Purposive approach: broader, considers the purpose of the Act, used especially with EU-derived legislation.
成文法解释：解释规则辅助法官。字面规则：按词语通常字典含义解释。黄金规则：当字面规则导致荒谬结果时，法院可修改含义（R v Allen案——'marry'包括举行婚礼仪式）。填补缺陷规则：法官审视该法意在弥补的法律漏洞，并据此解释（Smith v Hughes案）。目的论方法：更宽泛，考虑法律的目的，尤其适用于源自欧盟的立法。
12. The Legal Profession and Funding | 法律职业与资助
Barristers and solicitors: Solicitors mainly provide legal advice, prepare cases, and may represent clients in lower courts. Barristers specialise in advocacy in higher courts and provide specialist advice. The "cab-rank rule" requires a barrister to accept any case in their area of practice. Judges are appointed from experienced barristers or solicitors. Legal funding: For criminal cases, suspects at police stations may receive free legal advice. In court, legal aid may be available subject to interests of justice and means testing. For civil cases, legal aid was drastically reduced by LASPO 2012; conditional fee agreements ("no win, no fee") are common. McKenzie friends can assist litigants in person but do not have rights of audience.
出庭律师与事务律师：事务律师主要提供法律咨询、准备案件，并可在下级法院代理客户。出庭律师专门从事高级法院的辩护工作并提供专家意见。“接案规则”要求出庭律师接受其执业领域内的任何案件。法官从经验丰富的出庭律师或事务律师中任命。法律资助：刑事案件中，警察局内的嫌疑人可获得免费法律咨询。在法院，法律援助可能根据司法利益和财产审查提供。民事案件中，法律援助因2012年《LASPO》大幅减少；按条件收费（“不赢不收费”）常见。麦肯齐之友可协助自诉当事人，但不享有出庭发言权。
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