|Guest appearances of Iwan Thomas|
|First appearance||7 February 2017|
|Last appearance||13 February 2017|
|Episodes with Iwan Thomas|
Iwan Thomas is a guest on Countdown. He is a retired Welsh sprinter who won a silver medal for Great Britain in the 400m relay at the 1996 Summer Olympics, as well as a gold for Wales in the same event at the 1998 Commonwealth Games.