Drusilla I agree Lynch is very good and I'd like to see more of her on TV, but I'll also fess up and add that it's partly because I think she's strikingly beautiful and I can happily just sit there gazing at her.
She does a lot of theatre work and I think she's one of those actors who likes to maintain that, with an occasional TV show or film to keep the dosh coming in to buffer the less lucrative stage stuff. I've seen her on stage a few times and not only is she good there too, but is even more luscious in the flesh! (Look, I really am a supporter of the arts, honestly, not just a letch).