BBC America
The first series of the show premiered in Australia on ABC1 on 15 October 2010 and in the United States on BBC America two days later. The second series debuted in the United States on BBC America on 29 September 2011 and Australia on ABC1 on 24 February 2012. The third series ran in the United States on BBC America on four consecutive nights beginning 3 September 2013. The fifth series premiered in the United States on BBC America on 2 June 2019.