Companies Act 2006: Primary legislation governing company operations including capital maintenance rules, directors' duties (sections 171-177), financial assistance provisions, and corporate benefit requirements

Bills of Exchange Act 1882: Fundamental legislation for negotiable instruments, including specific requirements for promissory notes under Section 83, and defining rights and obligations of parties

Consumer Credit Act 1974: Relevant if the shareholder could be considered a 'consumer', covering registration and licensing requirements for credit arrangements

Financial Services and Markets Act 2000: Ensures compliance with financial instrument regulations and financial promotion rules

Insolvency Act 1986: Covers transactions at an undervalue, preference issues, and director responsibilities regarding corporate solvency

Common Law Principles: Fundamental legal principles including contract formation requirements, consideration rules, and capacity to contract

Corporate Constitutional Documents: Internal company documents including Articles of Association, shareholders' agreements, and board resolution requirements that may affect the promissory note