All Available Season All Season Series 1 Dec, 2004 4 episodes 7.0 Series 2 Feb, 2006 4 episodes 6.6 Series 3 Sep, 2007 4 episodes 6.7 Series 4 Sep, 2009 4 episodes 6.8 Series 5 Aug, 2010 4 episodes 7.0 Series 6 Jun, 2013 3 episodes 5.9
