This section applies where either regulator exercises its power to make general rules so as to make rules prohibiting persons, or persons of a specified description, from being remunerated in a specified way.
The rules may—
A provision that, at the time the rules are made, is contained in an agreement made before that time may not be rendered void under subsection (2)(a) unless it is subsequently amended so as to contravene a prohibition referred to in that subsection.