And for those of you who asked for a second series - this is from Wikipedia:
Series 2
A second series, consisting of eight 60-minute episodes, was commissioned officially by the BBC Head of Drama Commissioning Ben Stephenson on 11 January 2012. It is set to air in late 2012 or early 2013.
Seems a bit of a mystery why episode one wasn't repeated. The theme doesn't seem to be the reason, unless I'm missing something. I enjoyed the series very much (how about that lizard!?), and I'm looking forward to series 2. Anyway, thanks for your inputs.