Many locations within West Yorkshire and some in North Yorkshire were used for filming: Many scenes were filmed at Wakefield Kirkgate railway station with the main road approaching the station being closed for a period of time whilst a chase was filmed. A now demolished signal box, named 'Oakenshaw', which was located just down the line from Wakefield Kirkgate gets a mention within the programme. The public entrance and 6th floor interior (with genuine landscape views of Wakefield) of the HM Revenue & Customs Enquiry Centre, 'Crown House' on Kirkgate / Brunswick Street was turned into a police station for filming. Actors wearing high-vis police jackets with 'British Transport Police' on the back were seen outside Crown House. A sign stating 'North Counties Constabulary' was seen outside Crown House and this is believed to be the name for the fictitious local police force, yet the British Transport Police is mentioned with its correct name. One of the main shopping areas, Kirkgate, was also a location for filming.