Heartbeat was set in the 1960s and revolved around a group of police officers in the North Yorkshire town of Ashfordly. The series was based on the Constable books written by Peter Walker under the pen-name Nicholas Rhea.
The show originally starred ex-EastEnders actor Nick Berry as PC Nick Rowan, the Aidensfield policeman newly arrived from London. Berry also sings Heartbeat's theme song – the Buddy Holly song of the same name. Over time the show has evolved.