what do i say to them?
Just say he’s staying in your flat and you really don’t want him there but he won’t leave, don’t call the emergency number but just ask then if they can help or what you can do
Ask him politely first and if he become abusive call police they will remove him from property he has no right legally to be on your land or property
They wont be agressive they come and say he has leave if he dont then they can arrest or restrain order against him
If he’s not on the tenancy you can ask the police to help you