If have the time to rad... http://eur-lex.europa.eu/legal-conte...LEX:32002L0024
It is very complicated and not worth the work.
But the authorized unit for vehicle research for unitary release told me that they must just certify parts they are not certified yet in EU.
So i think that you can find all the parts from chineese bikes already in Europe. But as i say it is not worth the job to do.