Hello and thank you for your question. I will be very pleased to assist you. I'm a practicing lawyer in England with over 10 years experience.
Do you believe that he is using the address for some unlawful purpose - i.e. so that he can claim he is living there to obtain benefits or some other advantage - or is this simply a case of his using the address as a correspondence address please?
Does the property belong to or is it rented by you solely or does he have an interest in the property as well?