A permit is an official authorisation, usually issued by a public or regulatory body, allowing a person or organisation to carry out a specific activity that would otherwise be prohibited or restricted. In UK and Irish legal practice, permits arise in many contexts, including planning and environmental regulation, immigration, transport, gaming, and health and safety.“Permit” is generally a descriptive term rather than a single, defined legal concept; its precise meaning and requirements depend on the governing statute or regulations (for example, environmental permits under the Environmental Permitting (England and Wales) Regulations, waste and pollution control regimes in Scotland and Northern Ireland, or licensing and permitting provisions under Irish environmental and planning legislation).Key legal features typically include: specified conditions, duration, territory, and scope of authorised activity, with enforcement through variation, suspension, revocation, and criminal or civil sanctions for breach. Practitioners must check the enabling legislation and any guidance of the relevant competent authority (such as a local authority, environmental regulator or sectoral regulator). Usage is broadly consistent across England and Wales, Scotland, Northern Ireland and Ireland, although the underlying statutory frameworks and terminology can differ.