391.This section gives the Treasury power to amend by order certain definitions in this Part and others which are relevant to it, and to provide for exemption from the obligation to notify increases or reductions in control under sections 178 and 190.
392.The Treasury may alter the cases in which a person is said to acquire control as set out in section 179, and therefore it also has a power to change the definition of controller in section 422 to ensure the two remain aligned.  The Treasury may also alter the thresholds the crossing of which triggers the requirements in this Part to notify an increase or decrease in control.  This power is necessary to give effect to any future change in the single market directive requirements for controllers of UK authorised persons who are not currently covered by the single market directives.
Commentary on Sections Part Xii: Control Over Authorised Persons Section 192: Power to change definitions of control etc.