Where a relevant authority have incurred expenses for whose repayment the owner of the premises in respect of which the expenses were incurred is liable, either under this Act or by agreement with the authority, those expenses, together with interest from the date of service of a demand for the expenses, may be recovered by the authority—
and, as from the date of the completion of the works, the expenses and interest accrued due thereon are, until recovered, a charge on the premises and on all estates and interests in them.
A relevant authority, for the purpose of enforcing a charge under subsection (1) above, have all the same powers and remedies under the Law of Property Act 1925 and otherwise as if they were mortgagees by deed having powers of sale and lease, or accepting surrenders of leases and appointing a receiver.
The rate of interest chargeable under subsection (1) above is such reasonable rate as the authority may determine.
A sum that a relevant authority are entitled to recover under this Act, and with respect to whose recovery provision is not made by any other section of this Act, may be recovered as a simple contract debt in any court of competent jurisdiction.
Where—
it is not open to him to raise any question that he could have raised on an appeal under that section.
In this section "relevant authority" means a local authority or the regulator.