2.6—(1) This rule applies to a summary application where the time within which the application may be made is not otherwise prescribed.
(2) An application to which this rule applies shall be lodged with the sheriff clerk within 21 days after the date on which the decision, order, scheme, determination, refusal or other act complained of was intimated to the pursuer.
(3) On special cause shown, the sheriff may hear an application to which this rule applies notwithstanding that it was not lodged within the period prescribed in paragraph (2).