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Contracts (Rights of Third Parties) Act 1999: Primary legislation governing how third parties may enforce terms of a contract and their rights, which needs to be considered if the extension affects any third party rights under the original agreement

Law of Property (Miscellaneous Provisions) Act 1989: Key legislation, particularly Section 1, which sets out formal requirements for creating or modifying certain types of contracts, especially those relating to land or property interests

Common Law Contract Formation Principles: Fundamental principles from case law covering offer, acceptance, consideration, and intention to create legal relations, which must be satisfied in the extension letter

Consideration Principles: Legal principles regarding the requirement for consideration when modifying existing contractual obligations, ensuring the extension is legally binding

Statute of Frauds Requirements: Historical legislation still relevant today, requiring certain types of contracts to be in writing and signed to be enforceable

Electronic Communications Act 2000: Legislation governing the validity of electronic signatures and electronic communications in legal documents, relevant if the extension letter will be executed electronically

Companies Act 2006: Legislation setting out requirements for how companies can execute documents and the formalities required for valid execution