Preview: Viewing highlights of the week

What career path turns a convent-educated girl into the head of a multimillion-pound sex empire? In this film, Margaret McDonald tells her extraordinary story for the first time. She discusses her two obsessions, sex and money, and how she became the richest madam in the world. The World's Most Successful Madam, Thursday, 10pm, Channel 4:

Did the Romans invade Ireland? Presenter Rob Vance dives straight into a minefield of controversy in the first ...