there is no cold calling here cos she invited you round for the digital tv. She also asked YOU to source and supply the fire, it was not a contract created by you. If anything it should be you, who has the 7 days to think about whether you are going to take the job on or not. If she saw the fire before you fitted it, then shes bought it. The manufacturer did not tell you at the time of purchase that "if it gets fitted,then we will not accept it back". You basically have supplied the fire, the same as the manufacturer has supplied the fire to you. So do you get 7 days yourself, remember she invited you in and made the suggestion herself, you did-not go in prepared with brochures.