Bob Peacock was a police constable on patrol at Newcastle train station when eight-year-old Tracy Langton arrived there on a train from Manchester having run away from home. Bob approached Tracy when he saw her sitting alone and took her into the office to take her details. Tracy readily gave her name and address, and said she was there to meet her sister Susan Barlow, and that she hadn't told anyone. Bob arranged for Ken and Deirdre Barlow in Weatherfield to be contacted set their mind at ease about Tracy's whereabouts, and then escorted her to Susan's lodgings. He was friendly to Tracy throughout the encounter.

The officer was named as Bob Peacock in dialogue but credited as "Police Constable".