Informal adjudication describes a decision-making process by a public authority, regulator, professional body or similar, using light-touch procedures outside court, typically on the papers, without a formal hearing or strict rules of evidence. It is a descriptive expression rather than a term defined in UK or Irish legislation or case law, and should not be confused with statutory construction adjudication (Housing Grants, Construction and Regeneration Act 1996; Construction Contracts Act 2013).Typical features include paper-based determinations, expedited timetables, simplified submissions, consensual disposal (e.g. undertakings, warnings, fixed penalties) and internal reviews rather than full hearings. Despite its informality, it remains subject to public law duties: procedural fairness/natural justice, an impartial decision-maker, a fair opportunity to make representations, and reasons where required. Where civil rights and obligations or serious sanctions are in issue, Article 6 ECHR (UK) or Irish constitutional fair procedures may require enhanced safeguards, potentially including an oral hearing.Decisions reached by informal adjudication are often amenable to judicial review and, where provided, statutory appeal. Usage is broadly consistent across England and Wales, Scotland, Northern Ireland and Ireland: common law (and in Ireland, constitutional) fair procedures govern administrative decision-making by regulators, disciplinary bodies, ombudsmen and educational or membership institutions.