Identity theft

It's sligthly worrying, but we're having a case of semi-indetity theft. Since we've lived in this house, we've occassionally gotten mail to our address but not for us (right address, wrong name). I mostly assumed that this was because there was another address pretty similar on my street; # roadname and # roadname close. About a month ago, we got a delivery of Tescos groceries to our address but to a man named Fredrik di Gusto. Now that we know our neighbours, the person living at the similar adress is an old Lady, not named Fredrik di Gusto. Last week when I bought my graphics tablet down at Tottenham Court Road, when they asked for my postal code for shopper registration because of the price, the name 'Fredrik di Gusto' showed up as making purchases from our house.

We're going to contact our landlord, but it's kind of strange finding someone who is actively using our address.