AMS from the US to the UK

Is anyone here living in the US using Amazons AMS platform in the UK. If so how did you deal with the PO for your product, but you have to use Amazons provided shipping label. In order to use this service you must send in a product so they can test it. The address must be in the UK. How do you send it in from the US to the UK then ship it to Amazon locally using there shipping label.