Robert Lines

 was a policeman. As a sergeant in Smallmarshes, he filled in the Third Doctor on the disappearance of Marc Marshall and the emotional state in which they found Barbara Redworth. However, he would not let the Doctor see the cottage where Redworth was found until the following morning. (PROSE: The Scales of Injustice)

Later, after becoming a detective inspector for the Brighton CID, he met with Melanie Bush when she returned to Earth after her years of travel with the Doctor. He listened to her describe her experiences, then assured her that her parents missed her and would be "overjoyed" that she was home. He offered to take her home. (PROSE: Missing, Part One: Business as Usual)