If Danny Cohen has such faith in the show that he's repeating it on the flagship channel, why doesn't he commission a third series for BBC One? Or is there a reason he can't?
White Van Man - Series 2 Page 5
They've only broadcast two episodes so far. Plenty of time for him to decide there's an audience for the format on One. 
The ratings are good for the time slot (in my opinion), so here's hope!