Season 1972 BBC Two , 1972 Season 1973 BBC Two , 1973 Season 1974 BBC Two , 1974 Season 2012 BBC Two , 2011 - 2012 Season 2014 BBC Two , 2013 - 2014 Season 2015 BBC Two , 2014 - 2015 Season 2016 BBC Two , 2015 - 2016 Season 2017 BBC Two , 2016 - 2017 Season 2018 BBC Two , 2017 - 2018 Season 2019 BBC Two , 2018 - 2019 Season 2020 BBC Two , 2020 Season 2021 BBC Two , 2020 - 2021 Season 2022 BBC Two , 2021 - 2022 Season 2023 BBC Two , 2022 - 2023 Season 2024 BBC Two , 2023 - 2024