Heartbeat is a British police drama series set in 1960s North Riding of Yorkshire based on the "Constable" series of novels written by ex-policeman Peter N Walker, under the pseudonym Nicholas Rhea, and broadcast on ITV in 18 series between 1992 and 2010. It was made by ITV Studios at the Leeds Studios and on location. Heartbeat first aired on Friday 10 April 1992. The 372nd and final episode aired on Sunday 12 September 2010. Heartbeat proved popular from the beginning, when early series consistently drew over 10 million viewers. In 2001, Heartbeat came sixth in the UK TV ratings list with a peak audience of 13.82 million, and it was sixth again in 2003, with 12.8 million viewers. In autumn 2008, typical viewing figures were around 6 million per episode. Originally conceived as a vehicle for Nick Berry, on whom early series centred, the show has seen many characters come and go over the years. The final series starred Derek Fowlds, William Simons, Tricia Penrose, David Lonsdale, Peter Benson, Steven Blakeley, John Duttine, Gwen Taylor, Lisa Kay, Clare Wille, Joe McFadden, Rupert Ward-Lewis, and Nikki Sanderson.