One cannot evict a tenant without giving prior warning, even if they stay beyond the fixed term. If the owner wants possession, they need to give a 2-month notice that is called section 21. It should be a valid agreement of termination in writing with the date and signature authorized by an agent. If the stay has been for over 6 months the reasons should be mentioned. For joint occupancy, if one person wants to end the contract, it can lead to termination for all. Even for visiting the area or for inspection or repairs, the landlord has to give a 24-hour notification.