Shipping containers are seen stacked at Peel Ports container terminal in Liverpool northern England, December 9, 2016. (Photo: Reuters)

Prime Minister Rishi Sunak said Britain had agreed to join the Comprehensive and Progressive Agreement for Trans-Pacific Partnership (CPTPP), in a move his office said was the biggest trade deal since Brexit.

"Joining the CPTPP trade bloc puts the UK at the centre of a dynamic and growing group of Pacific economies," Sunak said in a statement.

Other members of CPTPP are Brunei, Canada, Chile, Malaysia, Mexico, New Zealand, Peru, Singapore and Vietnam. Britain is the first new member to join the group.