Employment Rights Act 1996: Fundamental legislation covering basic employment rights, fair treatment requirements, and proper documentation of employment records for performance appraisals.

Equality Act 2010: Ensures non-discrimination in performance assessment based on protected characteristics (age, gender, race, etc.), requires fair assessment criteria and reasonable adjustments for disabled employees.

Data Protection Act 2018 and UK GDPR: Governs the processing and storage of personal data in performance reviews, including employee privacy rights, data retention requirements, and access to performance records.

Trade Union and Labour Relations (Consolidation) Act 1992: Covers employee rights regarding union representation and collective bargaining agreements that may affect performance assessment processes.

Human Rights Act 1998: Ensures fundamental rights in the workplace including fair treatment, privacy, and dignity during performance assessment processes.

ACAS Code of Practice: Provides best practice guidelines for performance management, including fair procedures and documentation requirements for performance reviews.

Industry-Specific Regulations: Any sector-specific rules or guidelines that may affect sales manager performance metrics and assessment criteria.

Company Policies: Internal procedures and guidelines that must be aligned with performance appraisal processes while remaining compliant with legal requirements.

Employment Contract Terms: Specific contractual obligations and terms that may affect performance assessment criteria and procedures.