All Available Season All Season Specials Jan, 2007 5 episodes 0.0 Series 1 Sep, 2007 10 episodes 8.0 Series 2 Sep, 2008 12 episodes 7.9 Series 3 Oct, 2009 12 episodes 8.5 Series 4 Oct, 2010 12 episodes 9.1 Series 5 Oct, 2011 6 episodes 8.5
