Season 1 BBC Two , 2015 Watch now Season 2 BBC Two , 2017 Watch now Season 3 More4 , 2020 Watch now Season 4 Channel 4 , 2021 Watch now Season 5 Channel 4 , 2022 Watch now Season 6 Channel 4 , 2023 Watch now Season 7 Channel 4 , 2024 Watch now Season 8 Channel 4