4(1)For the purposes of this Schedule the previous limit of a rent shall be taken to be, subject to sub-paragraph (2) of this paragraph, the amount which at the date of registration was recoverable by way of the rent or would have been so recoverable if all notices of increase authorised by the Act of 1971 or by section 36(2) of this Act had been served.
(2)Where the rent includes an amount payable in respect of rates, the amount so payable, ascertained in accordance with Schedule 4 to the Act of 1971, shall be deducted from the amount specified in sub-paragraph (1) of this paragraph in calculating the previous limit of the rent.