This excerpt taken from the ICI 20-F filed Mar 31, 2006.
Changes to Shareholders Rights
If, at any time, the Companys share capital is divided into different classes of shares, the rights attached to any class may be varied, subject to the provisions of the UK Companies Act, either with the written consent of the holders of not less than three-fourths in nominal value of the issued shares of that class or upon the adoption of an extraordinary resolution passed at a separate general meeting of the holders of the shares of that class.
At every such separate meeting, all of the provisions of the Companys Memorandum and Articles relating to proceedings at a general meeting apply, except that (a) the quorum is to be the number of persons (which must be at least two) who hold or represent by proxy not less than one-third in nominal value of the issued shares of the class or, if such quorum is not present on an adjourned meeting, one person who holds shares of the class regardless of the number of shares he holds, (b) any person present in person or by proxy may demand a poll, and (c) each shareholder will have one vote per share held in that particular class in the event a poll is taken.
Class rights are deemed not to have been varied by the creation or issue of new shares ranking equally with or subsequent to that class of shares in all respects or by the purchase by the Company of the Companys own shares in accordance with the UK Companies Act and the Companys Memorandum and Articles.