Final appearance of Julia Sawalha as Carla Borrego.
"Gorgons Wood": According to Greek mythology, there were three sisters, Etheno, Euryale and (perhaps the best known) Medusa, with snakes for hair, who had the power to turn anyone who looked at them to stone.
Last episode produced by Verity Lambert. She would pass from cancer in 2007 - two years before the next episode would be completed in 2009.