(1) The notification requirements under Regulation 14(1) shall also apply to a person who holds, directly or indirectly -

(a) financial instruments that, on maturity, give the holder, under a formal agreement, either the unconditional right to acquire or the discretion to acquire, shares to which voting rights are attached, already issued, of an issuer whose shares are admitted to trading on a regulated market, or

(b) financial instruments which are not referred to in subparagraph (a) but which are referenced to shares referred to in that subparagraph and with economic effect similar to that of the financial instruments referred to in that point, whether or not they confer a right to a physical settlement,

where the percentage of voting rights in the issuer, as calculated in accordance with paragraph (4), reaches, exceeds or falls below one or more of the thresholds.