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…men of full age and competent understanding shall have the utmost liberty of contracting, and… their contracts… shall be held sacred and shall be enforced by Courts of justice. — Sir George Jessel MR, Printing and Numerical Registering Co v Sampson (1875) LR 19 Eq 462
This trainer owes its shape to the educators whose teaching has made contract law land the way it should.
Built in collaboration with Claude (Anthropic). The scenario engine, the drafting of explanatory prose, and the interactive features were developed iteratively in conversation. Substantive legal judgment, doctrinal selection, and final responsibility for accuracy are mine.
Any errors or infelicities are mine alone.
This trainer is for educational purposes only. It is the work of a Bachelor of Law student engaging with course material — not the work of a qualified legal practitioner, and it is not legal advice. Every scenario is a fictional teaching hypothetical, and every explanation should be treated as the author’s opinion until you have verified it against official sources: the statutes themselves, the reported judgments, and the materials provided by your unit coordinator.
Where this trainer and a primary source disagree, the primary source governs. Use of this material is at your own discretion and risk.
A party who wants to rely on an onerous clause in an unsigned document must take reasonably sufficient steps, at or before the time of contracting, to bring it to the other party’s notice: Parker v South Eastern Railway Co (1877) 2 CPD 416. And the more unreasonable or unusual the clause, the more explicit the notice must be — “Some clauses which I have seen would need to be printed in red ink on the face of the document with a red hand pointing to it before the notice could be held to be sufficient”: J Spurling Ltd v Bradshaw [1956] 1 WLR 461, 466 (Denning LJ).
Hence the red border, the pulse, and a button that will not arm until you have had a fair opportunity to read this notice — the caveat is this trainer’s onerous term, so it gets the red ink and the red hand.
If anything here reads as misleading, in tension with current authority, or otherwise raises a concern — or if you have a suggestion, a query, or a clarification you’d like to discuss — I would genuinely welcome the contact. Reach out at me@russluck.tech and I’ll do what I can.
CC BY 4.0 Contract Clinic © 2026 Russell Luck is licensed under a Creative Commons Attribution 4.0 International licence. You are free to use, copy, modify and redistribute this trainer — in whole or in part, for any purpose, including commercially — on one condition: acknowledge the source. Credit “Russell Luck, Contract Clinic”, link the licence, and indicate if you made changes.
The licence covers the original content of this trainer: the scenarios, explanations, case notes, tools and code. Quotations from judgments, statutes and cited works — and the LAW172 course materials this trainer digests — remain the property of their respective owners and are not relicensed here.
Your path lights up gold as you answer. Click any node you have already visited to jump back to it. The Vitiating factors mode starts where the formation modes finish — a contract validly formed on its face — and tests whether consent was tainted. Statute & illegality holds three separate machines: ACL s 18, ACL ss 20–22, and the illegality doctrine — which is not a vitiating factor at all, but a refusal by the court to lend its aid.
Dotted terms in the cards — invitation to treat, special disadvantage — open a short explainer with its authorities.
Cite chips: green = named in the unit materials. The dashed amber button on a step hides stray authorities the trainer supplied from beyond the materials — open that rabbit hole knowingly.
Answer the questions on the left to build the structure here.
Pao On v Lau Yiu Long looks like it contradicts half the consideration canon — until the cases are threaded onto separate skewers. Each skewer below is one line of authority, oldest at the top, read downwards. The rules never actually collide: what looks like contradiction is almost always two different skewers answering two different questions. Click any case for its full note.
▮ green edge = named in the unit material · ▯ dashed amber = not sighted in the unit material (🐇 rabbit-hole authority — cite with caution) · ▮ gold = Pao On, which threads three skewers at once