(1) Subject to subsection (2), in this Chapter "percentage level" means the percentage figure found by expressing the aggregate nominal value of all the shares comprised in the share capital concerned in which the person is interested immediately before or (as the case may be) immediately after the relevant time as a percentage of the nominal value of that share capital and rounding that figure down, if it is not a whole number, to the next whole number.
(2) Where the nominal value of the share capital is greater immediately after the relevant time than it was immediately before, the percentage level of the person's interest immediately before (as well as immediately after) that time is determined by reference to the larger amount.