The EU Commission has published a document with regards to market surveillance for products that are sold via the internet/online.
From the introduction:
The objective of this Notice is to assist Member State authorities in the enforcement of EU legislation on the safety and compliance of non-food products. This document refers to tangible goods and excludes non-embedded software and applications. The Notice concerns the application of the General Product Safety Directive and of Regulation (EC) No 765/2008, the two main legislative acts governing market surveillance and safety and compliance of products in online sales. The Notice also sets out good practices for the market surveillance of products sold online and for communication with businesses and consumers.
The full text of this notice can be downloaded here.