Trade regulation describes the body of law and regulatory measures governing how businesses buy, sell and supply goods and services, both domestically and in international trade. It is a broad, descriptive term rather than a single defined concept, and in UK and Irish practice typically encompasses competition law, consumer protection law, unfair commercial practices, sector‑specific regulatory regimes, and rules on imports, exports and customs.Key legal instruments include the Competition Act 1998, Enterprise Act 2002, retained EU competition and consumer law in the UK, and the Competition Act 2002 and Consumer Protection Act 2007 in Ireland, together with EU internal market and trade rules (for Ireland) and the UK’s post‑Brexit trade arrangements. Competition authorities (CMA in the UK; CCPC in Ireland) and sector regulators play a central role.In commercial practice, advising on trade regulation involves assessing distribution and supply agreements, pricing and exclusivity arrangements, merger control, market dominance issues, cross‑border sales restrictions, and compliance with consumer and advertising standards. Usage of the term is broadly consistent across England and Wales, Scotland, Northern Ireland and Ireland, though specific statutory frameworks and retained EU law differ.