Season 1 Channel 4 , 2007 Season 2 Channel 4 , 2008 Season 3 Channel 4 , 2010 Season 4 Channel 4 , 2013 Season 5 Channel 4 , 2014 Season 6 Channel 4 , 2015 Season 7 Channel 4 , 2016 Season 8 Channel 4 , 2017 Season 9 Channel 4 , 2019