There are several problems that have been identified as causing issues with controlled imports. These requirements are specified in the law and will result in the refusal of the consignment.
The law specifies that health certificates are only valid for 4 months from the date of issue, and that the consignment code must be shown on the packaging and must match that shown on the health certificate and results of sampling and analysis.
If a specified product (non-animal origin) requires an official certificate and the results of sampling and analysis, each lot number must have a separate certificate and test report which are specific to each lot. If more than one lot number is declared on the documents then the product will remain on Port Health hold at the Port until replacement original documents are received.
Advice from the Food Standards Agency is that controls apply on the products imported, regardless of the CN code used for tariff purposes. The risk to public health is dependent on the level of any contaminants present in the product, and this does not change with different CN code.
The consignment must not be removed from the port until the checks have been completed; consignments leaving the port are considered to be an illegal import and must be re-exported or destroyed.