Hi all I'm foreign in the UK. Thanks if any body can help me.

I used to live in London, then moved to the different city.

My situation looks like I've applied fro credit card, and my previous address has some problem! I have no idea, as somebody used to live there before me.
What I have to do? Who I have to contact? I want report somewhere or do something as in future I'm going to buy some property in the UK and that is not good at all.

Thank you very much for any help.