Hello, I am Law Denning and I am a practising solicitor in a High Street practice. I have been an expert on this website in UK law since 2008. During that time, as you appreciate, I have answered thousands of questions from satisfied users on a variety of subjects.
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You cannot change locks without warrant for possession to evict them. You wont get warrant without order for possession.
Your 1st step is to apply to court for possession under s21. I would also send s8 notice now and if the s21 fails you can fall back on the s8 notice (for arrears). Once you have the order for posession you then apply tfor a further order to evict them if they still dont move out.
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