Being just slightly not old enough to have caught most of the Tom Baker era, Earthshock was probably the most impressive Dr. Who I ever saw. Many a school visit to Wookey Hole caves was spent lurking right at the back of the school party in case of android attack... AFAIK, Eddie Izzard has just been a suggestion and nothing has yet been confirmed.
"The power of bakers, the power of artists; even the power of witches! It must be a power given by God... sometimes we suffer for it."- Ursula, Kikis Delivery Service.