UK Property Law
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A contract need not be drawn up. Any AST that runs past the fixed term automatically becomes a statutory periodic tenancy; it runs from one rent period to the next on the same terms as the preceding tenancy (save for the fixed term obviously).
If the landlord employs agent then they may want a new tenancy agreement put in place (because of their fee for this) but the landlord is not legally compelled to have one drawn up.
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