|IQA British Championships|
|IQA World Championships|
|IQA European Championships|
Brain of Britain
In 2007 he won Brain of Britain and in 2008 won the 3-year competition Brain of Brains beating TV's Egghead Chris Hughes and rival Pat Gibson and 9-year competition Top Brain titles, succeeding Kevin Ashman as holder.
National and International Titles
In 2008 he won the prestigious title of Quizzing World Champion. He has been capped six times for the National team (with five wins) and has a current European/World ranking of number 3, behind Kevin Ashman (his pairs partner) and Pat Gibson. In 2009 he was third in the World Quizzing Championships and won the British title for the first time. He was unable to attend the 2010 World Quizzing Championships due to serious illness.
Bytheway was one of the original British Quizzing Grandmasters (as created under the Order of Merit maintained by Quizzing.co.uk) and has the third largest haul of international medals, with 16, (5 gold, 6 silver and 5 Bronze) after Ashman (27) and Gibson (24).
In domestic competitions he played with the Milhous Warriors, the first British team to win the Club competition at the European Quizzing Championships, which comprises Ashman, captain and England international Tim Westcott, Welsh international Sean O'Neill, Eric Kilby, Keith Andrew and Brian Wilkins.
He several times appeared as an aspiring contestant on Who Wants to Be a Millionaire? but never qualified for the hot seat.
Mark Bytheway died on 9 July 2010 after a battle with esophageal cancer. As Mark was the reigning British Quiz Champion at the time of his death, the British Quizzing Championship trophy has been named in his honour, and will now be called the Mark Bytheway Trophy - aka the 'M*BY'.
A 2008 interview, after winning the World title, is available on the Norwegian Quiz Association website.