I've been pondering who is my favourite, and Robin is close to the top, but honestly, I couldn't come up with a definitive list. (Pat would probably have been in the first series.) As you say, they all have their role to play, and the more we get to know of them, thericher they are.

Thanks on the plague girl. I might go back and rewatch season 1, depending on whether any new sitcoms come out and how much time It Takes Two takes.