Where a tenant's liability to pay compensation under section 27A above relates to a period during which there has been a change in the interest immediately expectant on the determination of his tenancy, that section shall have effect with the following modifications.
For subsections (3) and (4) there shall be substituted—
Compensation under subsection (2) above shall become payable at the end of the appropriate period and there shall be a separate right to compensation in respect of each of the interests which, during that period, have been immediately expectant on the determination of the existing tenancy.
Compensation under subsection (2) above shall—
The amount which the tenant is liable to pay under subsection (2) above in respect of any interest shall be equal to the difference between—
In subsection (6), for "(3) and (4)" there shall be substituted "(3) to (4A)".