I have had several occasions where I have used Quidco and then had to make a claim as cash back not tracked. I then wait in excess of 6 months only to be told that the retailer has declined the claim as Quidco was not used. This seems to occur when the retailer is offering a substantial cash back deal. I make sure that I have no other browsers open and that link in Quidco is used. I will not be using Quidco again.