Consumer Rights Act 2015: Primary legislation governing consumer contracts, unfair terms, and consumer rights. Particularly relevant if one party is a consumer.

Contracts (Rights of Third Parties) Act 1999: Legislation governing how third parties may enforce terms of a contract, which could be relevant for deposit arrangements involving multiple parties.

Unfair Contract Terms Act 1977: Controls the use of exclusion and limitation clauses in contracts, ensuring fairness particularly in business-to-business contracts.

Unfair Terms in Consumer Contracts Regulations 1999: Protects consumers against unfair standard terms in contracts with traders and requires terms to be expressed in plain, intelligible language.

Common Law Contract Principles: Fundamental principles including offer, acceptance, consideration, and intention to create legal relations that form the basis of valid contracts.

Deposit Payment Principles: Legal principles regarding the enforceability of deposits, including rules on forfeiture and the distinction between deposits and part-payments.

Penalty Clause Doctrine: Legal principles established in Cavendish Square v Makdessi [2015] regarding the enforceability of penalty clauses and deposit forfeitures.

Financial Services and Markets Act 2000: Regulatory framework for financial services and markets, relevant if the deposit agreement involves regulated financial activities.

Consumer Protection from Unfair Trading Regulations 2008: Prohibits unfair commercial practices between traders and consumers, including misleading actions or omissions.

Electronic Commerce Regulations 2002: Governs electronic transactions and online commerce, particularly relevant for deposits paid electronically or agreements formed online.

UK GDPR: Data protection legislation governing how personal data must be handled, relevant when collecting and processing personal information in deposit agreements.

Data Protection Act 2018: UK's implementation of data protection standards, working alongside UK GDPR to regulate personal data handling.

Housing Act Regulations: Specific regulations governing property transactions and deposits, particularly relevant for property-related deposit agreements.

Business Protection Regulations: Various regulations protecting businesses in commercial transactions, including rules about payment terms and deposit protections.

FCA Regulations: Financial Conduct Authority regulations governing financial services and consumer protection in financial transactions.