Heartbeat is a British police procedural period drama series, based upon the "Constable" series of novels written by Nicholas Rhea, and produced by ITV Studios (formerly Yorkshire Television until it was merged by ITV) from 1992 until 2010. The series is set during the 1960s around real-life and fictional locations within the North Riding of Yorkshire, with most episodes focused on stories that usually are separate but sometimes intersect with one another; in some episodes, a singular story takes place focused on a major incident. The programme initially starred Nick Berry, Niamh Cusack, Derek Fowlds, William Simons, Mark Jordon, and Bill Maynard, but as more main characters were added to the series, additional actors included Jason Durr, Jonathan Kerrigan, Philip Franks, Duncan Bell, Clare Wille, Lisa Kay, Tricia Penrose, Geoffrey Hughes, Peter Benson and Gwen Taylor. Production of episodes involved filming of outdoor and exterior scenes around the North Riding, including in and around Whitby and Goathland, with interior scenes filmed at The Leeds Studios. Heartbeat proved popular from the beginning, when early series consistently drew over 10 million viewers, achieving a peak audience of 13.82 million in 2001, and 12.8 million viewers in 2003. Its success eventually led to a spin-off series, titled The Royal, as well as a special episode, and three documentaries. In June 2010, ITV announced the cancellation of Heartbeat after its eighteenth series, following discussions on its future. Premise Heartbeat is a period drama set within the North Riding of Yorkshire during 1960s. Plots for each episode take place within both the fictional village of Aidensfield and the fictional town of Ashfordly, as well as several other fictional villages and farms in the surrounding moors and countryside. On occasions, plots also include the real-life town of Whitby. Each episode in the series focuses on a set of at least one or two main storylines and a side story, some or all of which would cross over with each other and influence the outcome of their plots. Political tones for storylines, coinciding with the decade the programme was set in, were rarely featured in episodes, though some episodes featured occasional references to the counterculture movement, while others would sometimes delve into a dramatic single storyline concerning a major incident that characters would deal with and sometimes be affected by. The programme's title was chosen by writers to represent the series' key characters who worked as police