(4)The appeal shall be heard only on the question so formulated, and the respondents shall, at the hearing of the appeal, be allowed to argue that the case does not involve such question:Provided that nothing in this sub-section shall be deemed to take away or abridge the power of the Court to hear, for reasons to be recorded, the appeal on any other substantial question of law not formulated by it, if it is satisfied that the case involves such question.
