I dunno about the late and much-lamented Ms. Hickson as Granny - she's not really 'nasty' enough I think. Although Miss Marple had the razor-sharp mind I can't quite see her cracking her knuckles as she de-waxes her ear whilst playing Cripple Mr. Onion... she's just a little too lady-like to be Granny
Stephanie Cole however has got that 'hard as nails' trait (as per Diana in Waiting for God)
Miriam Margolyes or Judy Cornwell would be great for Nanny (although Judy seems a little too nice perhaps)
Sean Bean as Greebo *bounces* ooooo yeah!
