Period of ballot’s effectiveness
10. In Article 117 (period after which ballot ceases to be effective) for paragraph (1) there shall be substituted—
“(1) Subject to the following provisions, a ballot ceases to be effective for the purposes of Article 116(3)(b) in relation to industrial action by members of a trade union at the end of the period, beginning with the date of the ballot—
(a)of four weeks; or
(b)of such longer duration not exceeding eight weeks as is agreed between the union and the members' employer.”.