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Mental Capacity Act 2005: Primary legislation governing capacity to make decisions and delegate authority. Key considerations include ensuring the person giving consent has mental capacity, determining the scope of decision-making authority, and ensuring decisions are made in the person's best interests.

Power of Attorney Act 1971: While not directly governing letters of consent, provides important context for authority delegation and helps define the scope of authorized actions.

Data Protection Act 2018 and UK GDPR: Relevant when authority involves handling personal data. Ensures compliance with data protection principles and defines responsibilities for data handling.

Consumer Rights Act 2015: Applicable if the authority relates to consumer transactions. Defines rights and responsibilities in consumer contexts.

Fraud Act 2006: Provides framework for ensuring proper safeguards against misuse and helps define limits of authority to prevent fraud.

Contract Law Principles: Common law principles including offer and acceptance, consideration, intention to create legal relations, and capacity to contract that form the foundation of any legally binding agreement.