My first priority is the article on H2O: Just Add Water. It's in a very bad state; the grammar, spelling and sentence structures need serious editing and some information has not been confirmed (e.g. it is not currently known whether there will be a fourth series of H2O) or downright incorrect (e.g. a while ago the List of episodes firmly stated that Charlotte would come back at the end of series 3, though there was absolutely no proof for this allegation).
Furthermore, I know a lot about Are You Being Served? and several other British sitcoms and may edit here and there (as I have done in the past, but I have done a lot of my editing without logging in).