In my last house it was rented via Housing Association and i had to call police due to one resident's music was so loud at stupid o clock at night. The police were called as i had a young baby and she would wake up, the police officer did tell me that every time they have to visit a tenant then the housing association is made aware of it. After 3 strikes they are then evicted, this was over 10 years ago back on the day where you didnt have to wait ages for the police to answer their phone. It might be worth phoning or you can log a complaint on your local constabulary website and they may turn up in the night to see if he's up to no good.