If you got paid by work for sickness/unemployment, you had no need for PPI. That's one of the reasons I always put. Also, you can say you didn't know you had it, but if they have your original credit agreement and you've ticked the box for it, you're on shaky ground there. A lot of them back in the 90's were "opt out" agreements, so that is a big reason for mis-selling. They usually won't have the credit agreement for old accounts.