Britain is beginning talks with the 11 members of the Comprehensive and Progressive Agreement for Trans-Pacific Partnership (CPTPP) to join the pact it regards as important part of its future post-Brexit trade plans.
The CPTPP trade pact removes 95 per cent of tariffs between its members: Japan, Canada, Australia, Vietnam, New Zealand, Singapore, Mexico, Peru, Brunei, Chile and Malaysia.
Britain hopes to carve out a niche for itself in world trade as an exporter of premium consumer goods and professional services. Accession to the pact would supplement trade deals London is seeking, or has already agreed, with larger members.
Other members of the pact have already met to discuss Britain's application, but Tuesday's virtual meeting will see British attendance at the CPTPP's UK Accession Working Group, chaired by Japan, for the first time.
Joining the CPTPP in its current format could add about Stg 1.8 billion ($A3.4 billion) to the British economy in the long term - or less than 0.1 per cent of pre-pandemic gross domestic product, according to British government modelling.
While only a minimal gain for exports and economic growth, it locks in market access, including for the legal, financial and professional services sectors, and is seen by ministers as an important way to gain influence in a region where China is increasingly the dominant economic force.