This series is actually set in the same reality as Life on Mars / Ashes to Ashes (2008). However, rather than there just being a purgatory for cops, there's a purgatory for *everyone*. Frank Spencer is actually an avenging angel designed to punish the people he comes into contact with, and get them to realise the consequences of having been, on earth, a bad driving instructor, bad army recruitment sergeant, bad priest or whatever. Oh, and that Betty Spencer has clearly been a very, very naughty girl...
WMG / Some Mothers Do 'Ave 'Em