28. Section 280 of the Principal Act is repealed and the following section substituted:
“280. Where—
(a) an applicant makes application under section 275 for the review of a decision referred to in paragraph 275 (1) (a), (b) or (c); or
(b) an objector makes application under section 276 for the review of a decision;
a person to whom notice has been given under section 278 or 279 may apply to the Appeals Board to be made a party to the proceedings and, upon such an application being made, the Board shall, by order, make the person a party to the proceedings.”.