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Hello there, I'm Jak and will try to help you with this. Sorry to hear about your separation. All contracts of land must be formal and in writing, from what you say it seems like there is no leasehold agreement between you/your spouse and the friend in the dwelling, is that correct?
This seems like your friend is on the property as the result of a 'license'. In this scenario you are the licensor and the friend is the licensee. Licenses are not covered by any of the principal legislation protecting tenants outside the public sector except for the Protection from Eviction Act 1977. Generally speaking, a good analogy is a hotel guest, the hotel can compel the occupant of a room to leave immediately and without reason. From the information you provided, it seems that this will apply to your situation. It is a civil matter, so the police cannot assist you, you could ask if they will supervise if you predict that a public order offence is likely to take place if the friend will not go amicably when the facts of complained. Practicalities aside, the position in law is that you can require your friend (licensee) to move out of the property immediately, although you may choose to give them a small grace period to make arrangements, collect their belongings etc. However, there is no requirement for this. If you are satisfied with my explanation please rate the response at the top of the window. I will still be available for follow-ups.