All Available Season All Season Specials Dec, 2013 1 episodes 0.0 Series 1 Dec, 2014 6 episodes 9.3 Series 2 Dec, 2015 6 episodes 9.3 Series 3 Dec, 2016 7 episodes 9.0 Series 4 Dec, 2017 7 episodes 8.6 Series 5 Oct, 2018 7 episodes 9.0 Series 6 Oct, 2019 7 episodes 8.7
