In reply to Bob:
> is just that they don't come up to the CE standard so shops here won't sell them anymore.
The situation is slightly more complex than that.
RPs don't come with CE standard approval, they need to be tested first. You need an import licence for each batch of RPs that you want to sell. You can only get the import licence if the batch of RPs adheres to the CE standard. So the importer needs to test or arrange for testing each batch of RPs that they want to import.
This isn't economically viable now as people won't pay for the subsequent markup in the price of RPs with the range of other alternative micronuts now available