Night Dragon Haulage

Night Dragon Haulage was an Earth company. They transported goods throughout Europe. They would sometimes take homeless people to new cities. Clyde Langer's friend Ellie Faber was one of these. Ellie's acquaintance, Max, explained this to Clyde and said it was a "second chance." (TV: The Curse of Clyde Langer)

Behind the scenes
At the conclusion of the story, Clyde indicates to Sarah Jane that he'll never stop searching for Ellie. This is one of several plot threads introduced in series 5 which were left unresolved due to the series ending.