Regulations for exports of live shellfish to Sweden?

Question posted by Stephan Stahl, on behalf of DIT Yorkshire and the Humber in S70

Can anyone give a definitive answer to the question of "What are the regulations regarding the export of live shellfish (lobster. crab) from the UK to Sweden? I have heard comments regarding the requirement for an export licence, of vet's health certificates, evidence of traceability, but nothing confirmed in black on white. I need urgent clarification.