Announcement reposted from Amazon Europe:
As you are aware, Sellers wanting to offer their products with the Prime badge in the Amazon store in the UK, can do so using Fulfilment by Amazon (FBA) or directly from their own warehouses using the Seller Fulfilled Prime (SFP) programme. Sellers using SFP in the UK are free to choose from the approved Prime delivery carriers to ship their Prime orders (Royal Mail, DPD, Ship with Amazon, and Evri).
For Royal Mail, if you already have a business account and want to use rates that you’ve previously negotiated with Royal Mail, you can link that account to Amazon and purchase shipping labels at these rates via Buy Shipping. More information, see Buy Shipping services fees and pricing.
As of July 2024, if you have a business account with Evri, you can also link your Evri account to Amazon and purchase shipping labels via Buy Shipping at rates that you have previously negotiated, should you choose to do so. For more information, see Buy Shipping services fees and pricing.