Ending a tenancy
The type of tenancy in place would determine the process for terminating the agreement and the circumstances around why you wish to end it. It is advised that you, as the landlord, seek professional advice on the matter when you wish to gain vacant possession of your property.
GOV UK Tenancy agreements: a guide for landlords (England and Wales) offers some advice for landlords who wish to end an existing agreement. However, if you are currently a member of an accreditation scheme such as DASH, RLA or NLA, they may be able to make sure you stick to the correct procedure.