The UK government announced that UK businesses gained full access to the Comprehensive and Progressive Agreement for Trans-Pacific Partnership on 1 September 2026, after Canada ratified the UK's accession. According to the government's 1 September statement, the bloc's members had combined GDP of almost £13 trillion in 2025 with the UK included, against almost £10 trillion before UK accession. The deal was expected to add around £2 billion a year to the UK economy in the long run.

The government said more than 99% of current UK goods exports to CPTPP members would be eligible for zero tariffs. It also cited easier travel for eligible UK business visitors to Canada, who were permitted to stay up to six months rather than 90 days in any six-month period, and enhanced access to each other's public procurement markets, including in air transport, accounting and financial services.

Canada ratified the UK's accession on 3 July 2026, and the government said it took effect on 1 September. The UK signed the agreement in 2023, and it entered into force in 2024 with the first ratifying countries.