I have recently bought a property and the old occupiers have a lot of debt collection notices and i have no forwarding address for the couple, where can i look to see if my address is on the black list??
You can't blacklist addresses, only people. Have a look at Experian or Equifax website to clarify and find info about how to check your credit file/rating.
I heard from my financial advisor friend that if you move into an address recently vacated by a known debtor, the credit reference thingies can make an adverse judgment. So I agree with obonio