trader's customers who complained about them and wrote to the programme's research team with their experiences, through which Allwright will usually ask them what the trader was like, what they did, and how the customer felt about the whole experience. In some cases, the programme is sometimes contacted by a former associate of a business the programme is investigating, who can provide an inside look at how they perform and the associate's thoughts on such behaviour. After hearing enough about the trader, the next step focuses on filming the rogue trader in the act. How this is done varies, depending on the work that the rogue trader is involved in, but in all cases, hidden cameras are used to record everything, while either a trade or legal expert is brought in to view the recorded footage and provide their opinions, thoughts and criticism over what they see being done, including if they suspect a trader is lying to a customer about something that is untrue, questioning what a trader is doing on a job, revealing what something should really cost that a trader is overpricing, and if a trader is doing something illegal that they shouldn't be doing. The following lists how certain types of traders are filmed secretly to provide evidence of dubious work practices: DIY Tradespeople – For traders who are involved in DIY work, such as gas fitters and roofers, a house is arranged by the production team, rigged with hidden cameras and occupied by a "customer", who is in reality an actor, that the trader will visit. In most cases of this format, before the trader is called over to the house, a DIY expert recruited to comment about the trader's work practices, will set up a simple, basic fault that can occur, which the customer will point out and request to have fixed. After the trader has completed the job and left, regardless of the length of time that is taken and whether they did it alone or with others that they employ, both the expert and Allwright will then inspect the trader's work to determine its quality and value for money, along with what work shouldn't have been done, and the expert's general opinion on the trader's performance. This format is sometimes repeated a second time, to determine how they perform when faced with a similar issue or a different fault. Salespeople – For