Only read the opening post to this thread, this show hasn't been "relegated" to BBC3, I think it was always intended to be shown on BBC3 as the channel is aimed at a maturer age group. However it is repeated Wednesdays on BBC2, as already pointed out.
I really like this series, I hope it does get another series. The most cynical of Doctor Who fans label it as Doctor Who with swearing just to highlight that the show is aimed for an adult audience, which is a load of rubbish if you ask me, not one reference has been made to Doctor Who throughout the series apart from the speculation about the severed arm in the glass jar that Captain Jack protects so avidly.
Sorry if I've missed any other important points in this thread