15.—(1) Subject to paragraph (2) below, where in the case of two or more appeals to which these Rules apply it appears to the Tribunal–
(a)that some common questions of law or fact arise in both or all of them, or
(b)that for some other reason it is desirable to proceed with the appeals under this rule,
the Tribunal may order that the appeals be consolidated or heard together.
(2) The Tribunal shall not make an order under this rule without giving the parties and the relevant Minister an opportunity to show cause why such an order should not be made.