What is the nature of the threats?
Have you been to the police? If not, why not?
If you are being harassed, then it’s a police matter.
There is no magic solution to make the housemate stop threatening you.
It will not affect any application that you make for a Visa or residence.
The person is threatening to go to the police, you need to get to the police first. Tell the person that unless this stops, you have been advised to go to the police yourself with a view to getting them warned under the Protection from Harassment Act.
You can of course apply to court for a civil injunction to stop this or you could at least get a solicitor to threaten an application to court for a civil injunction but that is going to cost you money and there is no need to spend the money when the police will do this for you at no cost.
Can I clarify anything for you?
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The thread remains open.
You can only take action against the housemates of the housemate has also been harassing you.