161.This section places a duty on the competent authority to continue to maintain the official list.  Section 99 allows the competent authority to charge fees for this purpose.  Before this Act comes into force, the official list will be made up of securities that have been admitted by the competent authority under the statutory provisions of Part IV of the FS Act 1986 and securities and other financial instruments which were admitted by the competent authority under contract with issuers (for example gilts and covered warrants).  Under the Act there will be a single statutory regime for the official listing of all these securities and other instruments.
162.The legislation therefore gives the Treasury a power in subsection (3) to provide that certain categories of financial instrument cannot be admitted to the Official List.  This is a reserve power to ensure that the Treasury could stop the admission to the list of financial instruments which they consider, for example, pose undue risks to investors. Subsection (4) confers powers on the Authority to make listing rules.
Commentary on Sections Part Vi: Official Listing Section 74: The official list