European Union agencies have recently been highlighted as key sites for enabling future European law enforcement after Brexit. By operating as ‘nodes’ in trans-European scientific and policy networks, they provide a route to EU law enforcement in ‘third countries’ who wish to integrate with EU regulatory standards without full EU membership, creating ‘regulatory harmonisation’. There is an obvious link here to the potential to enforce regulatory arrangements and ensure ‘alignment’ following March 2019. However, ‘agencies’ have very different forms and functions. Some have hundreds of staff, are based in glamorous offices across the Union and have quasi-‘hard’ regulatory powers. Others have a couple of dozen staff and provide a discrete service to EU Directorates Generales, with more of a ‘soft’ monitoring role.