The European Union (Withdrawal) Act 2018 provides Ministers with the power to establish new public authorities to carry out functions currently undertaken by EU-wide bodies. This could result in a range of new regulatory bodies. The classification of public bodies in the United Kingdom in the recent past has been the subject of reform policies set out by central Government, with a focus on reduction of overall numbers and guidance on the justification for the creation of new bodies. Both trends are considered in this briefing.