Watched the whole second series (not seen first yet).
Very good episodic highly-fractured show, so patchy by its own nature, (especially the unrealistic Sue White set within a real context - by far the most disjunct character in nearly every show I've seen) but the emotional payoff at the end of the second series was a BIG letdown.
Having Mac ride off into the sunset, leaving Todd on the platform. Not good. Not even the worst person on earth would really do that. At least an enigmatic phone call or if not a quick visit to the platform to make an excuse. Riding off was a coward's way out for the character and the writers. It felt more like an episode end rather than a series end.
Okay, maybe they already knew there was to be a special but in truth a series should be a self-contained unit that makes sense within its own context. It can't make an appeal to "ah, but there's more." Red Dwarf tried that and it really peed me off. You only cheat the viewer.
People may say that not everything needs a happy end but happy or sad a film / book / series needs an ENDING and that wasn't a true ending, it was simply a jagged interruption to the continuing storyline.
Apart from that, it is by far the best comedy to come out of the UK for a long time.