Except as otherwise provided by this Part of this Act, where the rent payable for any statutory period of a regulated tenancy of a dwelling-house would exceed the rent recoverable for the last contractual period thereof, the amount of the excess shall, notwithstanding anything in any agreement, be irrecoverable from the tenant.
Where a rent for the dwelling-house is registered under Part IV of this Act, the following provisions shall apply with respect to the rent for any statutory period of a regulated tenancy of the dwelling-house:—
This subsection is subject to the following provisions of this Act: section 71(3), paragraph 1(3) of Schedule 7, . . . . . . and paragraph 3 of Schedule 20.
The date specified in a notice of increase under subsection (2)(b) above shall not be earlier than the date from which the registration of the rent took effect nor earlier than 4 weeks before the service of the notice.
Where no rent for the dwelling-house is registered under Part IV of this Act, sections 46 and 47 of this Act shall have effect with respect to the rent recoverable for any statutory period under a regulated tenancy of the dwelling-house.