(1) Where a person either -
(a) to his knowledge acquires an interest in shares comprised in a public limited company's relevant share capital, or ceases to be interested in shares so comprised (whether or not retaining an interest in other shares so comprised), or
(b) becomes aware that he has acquired an interest in shares so comprised or that he has ceased to be interested in shares so comprised in which he was previously interested,
then, subject to the provisions of sections 68 to 79, he shall be under an obligation ("the obligation of disclosure") to make notification to the company of the interests which he has, or had, in its shares.
(2) In relation to a public limited company, "relevant share capital" means the company's issued share capital of a class carrying rights to vote in all circumstances at general meetings of the company and it is hereby declared for the avoidance of doubt that -
(a) where a company's relevant share capital is divided into different classes of s