1183. Rent under antecedent long tenancy.

Where, on a claim by the tenant1 of a house2 to exercise a right to enfranchisement or extension3, a question arises4 whether a tenancy5 is or was a long tenancy6 by reason of a previous tenancy having been a long tenancy at a low rent7, the question whether the previous tenancy was one at a low rent must be determined8 by reference to the rent and rateable value9 of the house and premises10