Which original Dragon was known for founding Yo! Sushi before joining Dragons' Den?

Simon Woodroffe was known for founding Yo! Sushi before joining Dragons' Den.

Woodroffe founded the Japanese-style restaurant chain Yo! Sushi in 1997. The business became noted for serving dishes from a conveyor belt, a feature that made the restaurant concept visually distinctive and helped introduce a theatrical format to casual dining in Britain.

He was one of the original investors when the British version of Dragons' Den began. His business background differed from that of the show's finance-focused investors because his public profile was strongly connected with creating and developing consumer brands and hospitality concepts.

Yo! Sushi and Dragons' Den are sometimes linked to other Dragons' restaurant or leisure businesses, but Woodroffe is the specific founder associated with the sushi chain. He later left the regular panel, while the programme continued with successive generations of investors.