When an election is to be held, the Electoral Commission may not list a promoter as a third party in the period that—
(a) commences,—
(i) in the case of a general election that is held in a year in which Parliament is due to expire, on the 21st day before polling day:
(ii) in the case of any other election, on the 14th day before polling day; and
(b) ends with the day appointed as the latest day for the return of the writ.