2.11The time within which a notice under rule 2.10 must be given is—
(a)if the scheme decision was made at a meeting attended by the owner (or any of the owners), not later than 21 days after the date of that meeting, or
(b)in any other case, not later than 21 days after the date on which notification of the making of the decision was given to the owner or owners (that date being, where notification was given to owners on different dates, the date on which it was given to the last of them).