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Well you are allowed to give him notice - he is only staying at your house on the basis of your grace and favour - and in law would have nothing more than a licence - as such you are allowed to 'evict' him after giving him a reasonable period of notice - this can be a few days or a week. Thereafter you can simply change the locks in him - if he comes back then you would be abel to phone the police for him to moved away. Your safety is the priority in these matters.
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