53U.K.Section 175 has effect in relation to an accounting period of company B (see section 165(1) or 166(1)) where either of the following events occurs in that period or occurred in a previous period—
(a)shares or securities of company B are issued on or after 15 November 1991 in circumstances where they carry both rights referred to in section 170(1) and rights referred to in section 171(2), or
(b)shares or securities of company B issued before 15 November 1991 begin to carry on or after that date both rights referred to in section 170(1) and rights referred to in section 171(2) (whether or not they previously carried rights referred to in one of those sections).