Where any expenses are a charge on premises under section 81A above, the local authority may by order declare the expenses to be payable with interest by instalments within the specified period, until the whole amount is paid.
In subsection (1) above—
"interest" means interest at the rate determined by the authority under section 81A (1) above, and
"the specified period" means such period of thirty years or less from the date of service of the notice under section 81A above as is specified in the order.
Subject to subsection (5) below, the instalments and interest, or any part of them, may be recovered from the owner or occupier for the time being of the premises.
Any sums recovered from an occupier may be deducted by him from the rent of the premises.
An occupier shall not be required to pay at any one time any sum greater than the aggregate of—
This section does not apply to Scotland.