first two series were produced by Terence Williams. From the third series, Jonathan Alwyn was appointed as producer, with Chris Boucher acting as script editor. Series 4, 5 and 6 were produced by Geraint Morris. The series signature theme tune was composed by Derek Goom. Bob Cosford was the initial graphic designer, who matched the theme tune to the opening and closing graphics centred on a revolving police "star and crown" cap badge, which bore the familiar "E II R" device of English police forces, but in place of the force name around the blue circle, it instead featured the generic words "County Constabulary." In the first two series, Inspector Darblay is seen driving an orange Austin Mini (licence registration RVH 873T). In the third series she is seen driving a pale yellow Austin Mini Metro (licence registration MVP 519W) which, in episode 4 Amateur Night, she can be seen parking next to an orange Mini – possibly the car used in the previous two series – in the car park outside the Hartley Little Theatre, except for episode 5 A Breach of the Peace where she is seen driving a marked Ford Escort police patrol car. In the fourth series onwards, Inspector Kate Longton is seen driving a gold Austin Maestro (licence registration SOJ 626Y). It is interesting to note that according to the DVLA web-site, this vehicle was registered in February 1983, yet the official launch date for the Austin Maestro wasn't until 1 March 1983. This was possibly a product placement by the British Leyland (BL Cars) to give their new car some advertising. Filming locations Studio scenes for the first two series were recorded at BBC Television Centre, Wood Lane in London. From the third series onward, studio scenes were recorded at the BBC's Pebble Mill Studios in Birmingham. Exterior scenes were filmed in the Lancashire towns of Colne, Bacup, Accrington, Nelson, Burnley, Todmorden, Blackburn, Simonstone and Read. Other locations around east Lancashire, West Yorkshire and the Black Country (Tipton and Dudley) were also used. The exterior of Hartley Police Station seen throughout the entire series run was in fact the real-life police station on Bank Street in the town of Bacup. When the station closed in 2011, a campaign was mounted by fans of the series to save it from demolition, and turn it into a museum dedicated to the series' legacy. In 2012 it