right to rent for occupier?

I have a tenant who is a British student. Fine apart from the fact that she does a lot of damage. Not fine, I think her boyfriend is living in the property with her. I have cause to question his immigration status.
The tenant has another 10 months on her 24 months ast and has only small arrears. She has a guarantor who I will be charging for several items of damage.
It seems there is very little I can do to get rid of him. I am considering reporting him to the Home Office. Their website makes it clear that the legislation applies to all adult occupiers not merely names tenants.
Oh and did I say he broke the front door down and attacked the tenant. I have invoiced £220 for the door which has not been paid. She has a social worker on her case...any thoughts?
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