29.—(1) Subject to paragraph (2), an application to a Commissioner under section 15 of the 1998 Act for leave to appeal against a decision of a Commissioner shall be made in writing, stating the grounds of the application, within three months from the date on which the applicant was sent written notice of the decision.
(2) Where—
(a)any decision or record of a decision is corrected under regulation 26; or
(b)an application for a decision to be set aside under regulation 27 is refused for reasons other than that the application was made outside the period specified in regulation 27(2),
the period specified in paragraph (1) shall run from the date on which written notice of the correction or refusal of the application to set aside is sent to the applicant.
(3) Regulations 23(1) and 23(3) shall apply to an application to a Commissioner for leave to appeal from a Commissioner’s decision as they apply to the proceedings in that regulation.