I was tongue in cheek with my Rani comment.
Supposedly the Mrs. Flood actress previously appeared on Eastenders back in the 1990s when there was a one-off Dr. Who crossover episode for Comic Relief or another similar charity. Might simply be a sly in-joke about that history with the 4th Wall...
Morrus,
I think you are slightly forgetting a bit there Morrus. Yes, we have Moby Dick for II, but we also have a Tale of Two Cities. The purer distillation of Moby Dick is in First Contact for TNG.