If the relevant operator to whom a penalty notice relates is aggrieved by a penalty and desires to question its validity on the ground—
he may make an application to the court under this section.
An application under this section by a person shall be made—
If an application is made under this section in relation to a penalty, the penalty need not be paid until the application has been determined.
On an application under this section on the ground mentioned in subsection (1)(a) or (b) above the court, if satisfied that the ground is established, may quash the penalty or (instead of quashing it) make provision under either or both of paragraphs (a) and (b) of subsection (5) below.
The provision referred to in subsection (4) above is—
On an application under this section on the ground mentioned in subsection (1)(c) above the court, if satisfied that the ground is established, may specify different dates by which different portions of the penalty are to be paid.
Where the court substitutes a penalty of a lesser amount it may require the payment of interest on the substituted penalty at such rate, and from such date, as it determines; and where it specifies as the date by which the penalty, or a portion of the penalty, is to be paid a date before the determination of the application it may require the payment of interest on the penalty, or portion, from that date at such rate as it determines.
Except as provided by this section, the validity of a penalty shall not be questioned by any legal proceedings whatever.