Thanks for your question.
If the condition of the dwelling house (or common parts) has deteriorated owing to acts of waste by, or neglect of, the tenant or any person residing at the dwelling house and the tenant has not taken reasonable steps to remove that other person then you can serve a S21 Ground 13 Notice under the Housing Act 1988 on the Tenant seeking possession of the property and giving two weeks notice to vacate.
It is very important that the notice is in the Court form, if it is not then you may have to start the process again at a later date. Notice forms are available for download here:-
If the notice period expires and the tenants have still not left then you will have to make an application to Court for an Order for possesion.
If rent arrears are outstanding after they have vacated then you should write a formal letter before action to them specifying the tenancy agreement, the termination, the rent outstanding and to which period the arrears relate, send it by recorded delivery and keep copies of all correspondence (including the notice itself above), start a file – it will help you late if you have to make a claim at Court for the arrears.
You can recover the money owed in arrears of rent yourself by using HMCS's online service www.moneyclaim.gov.uk. It’s very straight forward, cheap and very easy to use.
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Edited by Thomas on 3/1/2010 at 2:24 PM EST