The document discusses key definitions and concepts relating to the banker-customer relationship under UK law, including: 1) The definition of a bank focuses on collecting deposits, paying cheques, and keeping customer accounts. A customer relationship is formed upon account opening. 2) Regulations include various Banking Codes covering retail, business, and mortgage customers. The Data Protection Act governs use of customer data. 3) Key implied terms in the banker-customer contract include duties to repay deposits, honour valid instructions, give notice before account closure, and maintain confidentiality of customer information.