My husband and I have a small house which we rent out. Three tennants have moved out today, leaving the place in a terrible mess, but that's another story.... Whilst we were cleaning up l found a piece of mail with a company name and our address. Googled the company and the director is someone we've never heard of (ie not one of the three names on the tenancy agreement). It's in the tenancy agreement that they should not have been running a business from our property. Is this something I should be worried about? Should I report this person? Who should I report her to? Any advice gratefully received.