Hi sloan
I would agree with Melanie that you should probably cancel these payments as soon as possible, but I would be a bit more optimistic regarding your chances of success in a claim.
The selling of these policies has been described as being little short of a 'protection racket'.
Citizens Advice (CAB) has raised a 'super complaint' with the OFT concerning the mis-selling of these policies - couple of extracts appear relevant to your case:
A CAB in Surrey reported that a client had been sold a loan protection plan although he had long-term mental health problems. An additional £2,200 was added to his £8,900 loan for the PPI. At the time of signing the agreement the client was very unwell and was not aware of what he was signing. The bank was aware of the client’s situation and that the client might not be eligible for the insurance protection policy.
Also -
Policies sold by several well-known mainstream lenders exclude cover for common problems like bad backs and mental health problems that can stop people working. Many also have arbitrary age limits and ban the self-employed and those on fixed-term contracts from making a claim.
These policies are sold on a one-size-fits-all basis with scant regard for individual circumstances. However it seems to me that if any of the policies your wife holds has exclusion clauses for mental health problems it is a clear case of mis-selling. So although you would have little chance of claiming 'against the policies' this almost works in your favour because it is further evidence that they were inappropriate for your wife's situation.
So I would have thought you would have a very good case for claiming a refund of premiums based on mis-selling. However you will undoubtedly have to dig in for the long haul and probably at least threaten Court action. But, as in the 'bank charges' situation, the companies would be very likely to settle before it ever got that far, because to have a case go against them would be very bad news as it could open the floodgates for millions of potential claims.
-Best
'5 years sticking my head into the Lion's mouth of debt !'