Season 1 BBC One Season 2 BBC One Season 3 BBC One Season 4 BBC One Season 5 BBC One , 2007 Season 6 BBC One , 2007 - 2008 Season 7 BBC One , 2008 Season 8 BBC One , 2008 Season 9 BBC One , 2009 Season 10 BBC One , 2009 - 2011 Season 11 BBC One , 2010 - 2013 Season 12 BBC One , 2011 - 2012 Season 13 BBC One , 2012 - 2013 Season 14 BBC One , 2013 - 2014 Season 15 BBC One , 2014 - 2015 Season 16 BBC One , 2015 - 2017 Season 17 BBC One , 2016 - 2017 Season 18 BBC One , 2017 - 2018 Season 19 BBC One , 2018 - 2020 Season 20 BBC One , 2019 - 2020 Season 21 BBC One , 2020 - 2021 Season 22 BBC One , 2021 - 2022 Season 23 BBC One , 2022 - 2023 Season 24 BBC One , 2023 - 2024