This is the second of two position papers from the Radicalisation Awareness Network’s Health and Social Care (RAN H&SC) working group focusing on Multi-Agency Working (MAW). The first paper, published in 2018, provided the context for MAW in preventing and responding to violent extremism. In particular, it considered different models of MAW, difficulties sharing information across agencies, and the challenges of responding to the many and varied forms of extremism in EU countries. This second paper presents a series of case studies on MAW in the EU and identifies key considerations for those intending to introduce MAW in this space in future.