2.4If a flat is owned by two or more persons the vote allocated as respects that flat may be exercised in relation to any proposal by either (or any) of them, but if those persons disagree as to how the vote should be cast then the vote is not to be counted unless—
(a)where one of those persons owns more than a half share of the flat, the vote is exercised by that person, or
(b)in any other case, the vote is the agreed vote of those who together own more than a half share of the flat.