657.This Part is concerned with the Authority’s (and in certain cases the Secretary of State’s) power to seek injunctions and restitution orders from the High Court, or in Scotland the Court of Session, against both authorised and unauthorised persons where it appears that certain requirements have been, or might be, contravened.  Section 384 also gives the Authority the power to require restitution to be paid without having to apply to the courts for a restitution order, but this direct power can only be used against authorised persons.
658.The powers contained in this Part may be exercised by the Authority in relation to breaches which constitute an offence under the Act, or which the Authority has power to prosecute under section 402, or any breach of any other requirement imposed by or under the Act, such as a rule made under Part X.  The Secretary of State may exercise the powers in relation to any breach which constitutes an offence which the Act gives him the power to prosecute under section 401.
Commentary on Sections Part Xxv: Injunctions and Restitution