A penalty shall be treated as a debt owed to the regulator.
The Treasury may make regulations authorising the regulator—
to charge interest on penalty not paid during the period specified under section 228(2)(d);
to impose one or more additional penalties where a penalty is not paid during that period.
Interest and additional penalty shall be treated as penalty (and may have the effect of increasing the penalty above a limit set by section 229).
Regulations under subsection (2)(a) may provide for an interest rate to be—
set by a specified person, or
determined in accordance with the regulations.
A penalty notice may include provision allowing a discount if the penalty is paid on or before a date specified in the notice (falling within the period specified under section 228(2)(d)).
A person to whom a penalty notice is given on the ground in Case 6 of section 227 may not be prosecuted for the offence by reference to which the penalty notice was given.