Alison Jones looks at vertical agreements in Chapter 3. This chapter charts the development of UK competition law and policy towards vertical agreements over the 20 years since the Competition Act 1998 came into force. It traces how UK policy has evolved, before examining the UK jurisprudence that assesses the compatibility of vertical agreements with competition law. It notes that although many UK cases initially focused on resale price maintenance, more recently a number have analysed vertical restraints affecting online selling, which have proliferated since 2000 with the rapid growth of e-commerce. The chapter also considers how the law could, or should, develop in the future, especially now the transition period following the UK’s departure from the EU has ended. An important issue considered is whether, post-Brexit, the UK authorities should continue to follow EU competition law in this sphere, which has in significant respects been influenced by internal market considerations, or whether it should take a different course.