International Trade Secretary Liz Truss had struck the deal with Japan’s foreign minister Toshimitsu Motegi on a video call on 11 September.
After the ceremony, Ms Truss said: “How fitting it is to be in the land of the rising sun to welcome in the dawn of a new era of free trade.” She added it would “pave the way” towards UK membership of the wider Trans-Pacific Partnership.
UK and Japan have signed a free trade agreement at a ceremony in Tokyo, hours before negotiations on a post-Brexit deal with the European Union are due to resume.
The UK-Japan Comprehensive Economic Partnership Agreement (CEPA), which was agreed in principle last month, marks Britain’s deal with a major economy since Brexit.
UK government claims the agreement will boost trade with Japan by £15.2bn over the next 15 years – and UK businesses will enjoy tariff-free trade on 99% of exports to the country