Retaliatory measures are actions taken against a person in response to them exercising a legal right or performing a protected act, such as making a complaint, whistleblowing, bringing a claim, or asserting employment or tenancy rights. The concept commonly arises in employment law, discrimination law, whistleblowing, landlord and tenant law, and regulatory enforcement.Across England & Wales, Scotland, Northern Ireland and Ireland, the term is descriptive rather than a single defined legal concept, but it is reflected in statutory protections against victimisation and detriment (for example in equality, whistleblowing and health and safety legislation) and in case law. Typical retaliatory measures include dismissal, disciplinary action, demotion, refusal of promotion, reduced hours, eviction or service of a notice to quit, and other forms of disadvantage or harassment linked to the protected activity.In UK employment and equality law, tribunals focus on whether the claimant suffered a “detriment” because of the protected act. In housing, “retaliatory eviction” describes landlords seeking possession because a tenant has complained of disrepair or asserted statutory rights. Proving causation between the protected act and the measure is usually central to liability.