There have been plenty examples of people thinking they didn't have it but a little box was ticked on their behalf without them knowing part of the cost was PPI. Only because you said no when asked doesn't mean to say you didn't get PPI when not asked. Particularly bad for this method of...
I've always suggested doing it yourself. Despite this, the other month I got an email from one of these companies suggesting that all I had to do was give all the addresses I'd lived at for the last 15 or so years and they would do the rest. They would then tell me who I could claim against and...