I have to confess I've never seen an Ace episode either, but I still like her style :D

I would have worked in the Sarah Jane adventures, but I've never seen an episode of them. And, also, it's harder to fit her in because she's so much a part of the Doctor's backstory, which is vastly truncated here.

I did rather think about having Lethbridge somehow miraculously escape death by Dalek and get his own show, but god knows what I'd really do with it. :D