London hosted the first Yo! Sushi restaurant founded by Dragon's Den investor Simon Woodroffe.
The first Yo! Sushi opened in Soho, a central London district, in 1997. Its conveyor-belt presentation and quick-service approach helped distinguish it from more traditional restaurant dining. Soho’s busy nightlife, retail and entertainment economy provided a high-profile setting for the experiment.
Simon Woodroffe later became one of the original investors on the British version of Dragon's Den. His association with the BBC programme sometimes leads people to remember the brand through television rather than through its earlier restaurant launch.
The answer is London rather than Soho because the question asks for the city. Soho is the more specific district. Yo! Sushi should also not be confused with YOTEL, Woodroffe’s hotel brand, despite the related “YO” naming.