The expansion of the EU has generated vast interest and debate about an alleged crime–migration nexus. The gradual disappearance of borders within the EU has created opportunities for easier people movement, and potentially for offenders to commit criminal offences in other countries. The authors have found that little work has been undertaken to understand the general nature of criminal activity by intra-EU migrant populations. Data on localised offending by foreign nationals can be used to inform intelligence by national and international police agencies, to generate effective cross-border information exchange, aid investigatory techniques and significantly inform crime reduction activity and policies. However, where such information is not collected and available for analysis within member states, informed knowledge within and between member states is difficult to achieve. In order to begin to address these discrepancies, the authors suggest multi-disciplinary and mixed methods.