Despite all the fear mongering, all you need is a statement of compliance (declaration of conformity) from the manufacturer.
This is also true for UL/CSA in North America. If anyone ever asks, show the statement. I have been told this by the certification lab I use for products I develop. (TUV Germany)

There is no expectation of retest by an importer - frankly, most are non-technical and would not know where to start, and if you went to a certification lab they would say "I'm happy to take your money, but there is no need".

Just file away the certificate and sleep comfortably at night.