Ppi With First National Bank

Ppi With First National Bank,  I had a secured First National Bank loan in the late nineties which I believe had PPI
At the time FNB was owned by Abbey National/ Santander.

I submitted a PPI enquiry to Santander but they only came back with details of my old bank account with them.

I believe that FNB were purchased by GE Money at some point.
Should I be making my enquiries with them?