Great link Chris, as someone who used to test for such notifiable diseases I would advise anyone who has been facing mortalities on a large scale to contact their local authority, DEFRA on the mainland, In N.I. there are no reports of SVC, we would like to keep it that way.
There were reports of smuggled ornamental fish from Europe to the UK. Although customs officials have tightened security measures.
For notifiable diseases, testing agencies foot the bill, they are obliged to investigate under European directives. So the average Joe Bloggs will not be charged.