From 1st January 2021, import controls will apply for EU goods entering Britain.
The Withdrawal Agreement Protocol will apply to trade between Britain and Northern Ireland, and between Northern Ireland and Ireland.
Business is directed to prepare for border controls by making sure it has an Economic Operator Registration and Identification (EORI) number, and also looking into how declarations should be made, such as by using a customs agent.
The UK Government will ensure facilitations currently available to rest of the world traders will also be open to those trading between GB and EU.
The press announcement is here.