You are under no obligation to vacate the property at the expiry of the fixed term - if the has not served the s21 notice then he cannot apply for an order for possession from the Court. It would be thrown out.
He has to serve you the s21 notice giving two months.
Check the tenancy deposit - ask for details of the tenancy deposit scheme in to which it has been placed. If it has not been so placed you can sue the landlord for the return of the deposit and three times the deposit amount (assuming you are occupying under an assured shorthold tenancy).
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