You mentioned imported components in a product - if they are not CE marked in their own right (e.g. a PSU) are you saying I definitely can't use it in a larger product, or if I have the product data, can I make my own assessment?

If you use a component or sub-assembly that is subject to CE marking then it should be made available to you with the appropriate CE marking and Declaration of Conformity supported by a Technical File. You can use it but you take responsibility for the compliance of that component or sub-assembly within the complete product. Be aware however that this is not always very straightforward; i.e. you may have an EMC failure as a result of this part or you may have to obtain detailed constructional information which you may not have access to.

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