The European Commission has proposed the establishment of a European platform to enhance co-operation in the prevention and deterrence of undeclared work. The Government consider that the activity against which the co-operation is directed—failure to declare work—is treated as a criminal matter in many member states, and that the proposal requires law enforcement authorities to collaborate with the platform. The Government have therefore asserted the United Kingdom’s opt-in in respect of this proposal, to the extent that the proposal requires law enforcement authorities to collaborate with the platform, and have decided to opt in.