David Richard Bull is an English doctor, author, and host and commentator on a variety of British and US television programmes, such as Sugar Dome,the BBC's Watchdog, Watchdog Healthcheck,Newsround, Living TV's Most Haunted Live!, Channel 4's Richard & Judy, Tomorrow's World, and Sky's The Breathing Life Awards. He is a regular panelist on "The Wright Stuff" with Mathew Wright Channel 5. He has also made repeated appearances on The Rachael Ray Show in the US. In 2006, Bull was nominated as the Conservative Party candidate for Brighton Pavilion in the following general election. He stood down in 2009 to head up a Conservative policy review on sexual health, an area about which he has been outspoken, and was replaced by Charlotte Vere.