A comprehensive SQE overview of the principles and consequences surrounding the termination and discharge of contracts. The first source details various methods of contract ending, including Discharge by Performance, which requires meeting the doctrines of precise and entire performance, and other voluntary or involuntary termination methods like Mutual Agreement or Operation of Law. The second source focuses on Breach of Contract, distinguishing between Actual Breach and Anticipatory Breach, and explains how the classification of a breached term (Condition, Warranty, or Innominate Term) dictates the available remedies. The third source introduces the Doctrine of Frustration, explaining how unforeseen, uncontrollable events can automatically terminate a contract when performance becomes impossible or radically different, and outlines the financial consequences under the Law Reform (Frustrated Contracts) Act 1943. Finally, the fourth source describes the principles of Restitution and Unjust Enrichment, which aim to return parties to their pre-contractual state by preventing one party from unfairly benefiting at the expense of another, particularly when a contract fails or is rescinded.