The series is set in the fictional South Midlands town of Denton, and is marked by a gritty tone. It is believed[by whom?] that Denton is in either Berkshire or Oxfordshire, though there are many references to Reading, Oxford, and in particular, Swindon. In the earlier episodes, the M4 and A417 were often seen, and the map of Swindon was seen in the control room, although a map of Reading was used occasionally. Paperwork given to Frost and other characters refers to Denton station as being part of the Thames Valley Police. The programme was produced by ITV in Leeds, and most of the outdoor locations were shot in West Yorkshire. Several scenes were filmed in and around the city and district of Wakefield and neighbouring small towns of Pontefract and Castleford, West Yorkshire.
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