Sending goods from UK to Northern Ireland (when the customer is a business customer)

It would seem that from 30/09/2024 the rules are adjusting when goods are sent from Great Britain to Northern Ireland (and the the recipient is a business).

It would be a lot easier if Amazon had a way for sellers to block B2B orders to BT postcodes

but otherwise

if you google this text

apply-for-authorisation-for-the-uk-internal-market-scheme-if-you-bring-goods-into-northern-ireland

these is a link to a uk .gov webpage with all the details of registration and document keeping requirements