PLT INTERFERENCE
One point not mentioned in various forums about this subject is the fact that a device can have a CE approval mark without having being formally tested/approved, there is a option in the regulation for the maker to self certify stating that the device meets approval without have to show any documentation to prove it unless challenged or a situation exists where it is necessary to prove it for legal reasons in court or to a relevant authority when challenged.
So a situation can exist( and has done for some products) that the product does not meet the marked standards but is marked as such and marketed. As I understand the guilty party is the person who signed the document not the reseller( eg not BT) unless the reseller has knowledge that the product does not meet the standard.
Steve