s 14
An order of the Tribunal may be reviewed, varied Review of or set aside by the Tribunal in the following cases, Tribrnof the namely— (a) where the circumstances affecting the question restif oa the pt bang ofatis Alyt orother as a, altered since the order was made; or (b) where the order was made in consequence of any fraud, misrepresentation or mistake; or (c) where fresh evidence of a material nature, which could not by the exercise of reasonable diligence have been produced when the order was made, is available; or (d) where the order was made in the absence of any necessary or proper party whose absence was not due to any default or neglect on his part; or (e) where, in the opinion of the Tribunal, substantial injusticé has been occasioned by the order.