Revealing mistake: It's a valiant effort, but the scenes of Sherlock & Irene in a London street are shot in New York. Not only is the architecture wrong but you can see a U.S. pedestrian crossing signal over Irene's shoulder. (00:16:15)
Revealing mistake: To demonstrate that "Clean This House" isn't a real company, Sherlock shows the man his phone displaying a 404 "file not found" message. Except the browser bar at the top simply shows "Clean This House", not a website domain. As written, he's just searched for the phrase, not tried to load a website.
Answer: I'm the same person who asked this question. I discovered it was Molly Price whom I recognized from Third Watch.
Cathrine R
It should be noted Donna was Jim Fowkes‘ secretary. Donna killed Peter.
Bishop73