Pete2 Trimmer

Scenario. Company based in Belgium purchases a product manufactured in Germany, has a Certificate of Origin (COO) for the product from the German manufacturer. Product is sold as part of a range of goods by the Belgium company, which has a separate UK branch, registered as a Ltd company. Customers in the UK place orders through the UK branch, goods are imported / sent from Belgium and from a UK storage warehouse. Does the UK customer need a certificate of origin? Why would they need one? Sending the original COO will breach a NDA. Can the Belgium company or the UK company write their own COO showing the products original country or Belgium? (if the UK customer does require one and not just want one). Thanks