UK Property Law
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There is no requirement for a tenant occupying a property under an assured shorthold tenancy is not required to serve any form of notice on on the Landlord in order to leave on the expiry of the fixed term. It is only the landlord that has to serve notice (a s21 notice) if they wish for the tenant to vacate on the expiry of the fixed term.
It would be prudent however to provide a letter/email to the landlord confirming that she is to leave because although there is no requirement to do so it will prevent the landlord claiming that she stayed after the fixed term, thereby creating a statutory periodic tenancy which does require notice to be served by the tenant.
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