(1) An authorisation may be given by the Commissioner of Police or by a Deputy or Assistant Commissioner of Police. The power conferred by this section cannot be delegated.
(2) An authorisation may be given orally or by instrument in writing.
(3) If the authorisation is given orally, it must be confirmed by instrument in writing as soon as it is reasonably practicable to do so.
(4) An authorisation must--(a) state that it is given under this Division, and(b) describe the general nature of the public disorder or threatened public disorder to which it applies (including the day or days it occurs or is likely to occur), and(c) describe the area or specify the road targeted by the authorisation, and(d) specify the time it ceases to have effect.