Contract Law Principles: Common law principles governing contract formation, including agreement formation, consideration, and intention to create legal relations. Essential even for internal SLAs though they may not be intended to be legally binding.

Data Protection Act 2018 and UK GDPR: Legislation governing personal data processing, including data protection obligations between internal departments and data security requirements. Essential if services involve handling personal information.

Employment Rights Act 1996: Key legislation affecting employees involved in service delivery, including considerations for working time and resource allocation between departments.

Health and Safety at Work Act 1974: Legislation concerning safety obligations in service delivery and risk management requirements between internal departments.

Equality Act 2010: Legislation ensuring non-discrimination in service provision and requirements for reasonable adjustments where necessary.

Company Policies: Internal organizational policies and procedures that must be adhered to in the service level agreement.

Industry Regulations: Sector-specific regulations that may affect the internal service delivery and must be considered in the SLA.

Quality Standards: Relevant quality standards (such as ISO certifications) that need to be maintained in internal service delivery.

Information Security Standards: Standards and requirements for maintaining information security between departments in service delivery.

Corporate Governance Requirements: Internal governance frameworks and requirements that must be reflected in the service level agreement.