159Offers of securities on admission to approved exchange
(1)Subject to subsection (2) and section 161 below, no person shall issue or cause to be issued in the United Kingdom an advertisement offering any securities on the occasion of their admission to dealings on an approved exchange or on terms that they will be issued if admitted to such dealings unless—
(a)a document (in this Part of this Act referred to as a " prospectus ") containing information about the securities has been submitted to and approved by the exchange and delivered for registration to the registrar of companies; or
(b)the advertisement is such that no agreement can be entered into in pursuance of it until such a prospectus has been submitted, approved and delivered as aforesaid.
(2)Subsection (1) above does not apply if a prospectus relating to the securities has been delivered for registration under this Part of this Act in the previous twelve months and the approved exchange certifies that it is satisfied that persons likely to consider acquiring the securities will have sufficient information to enable them to decide whether to do so from that prospectus and any information published in connection with the admission of the securities.