"It can be seen from s.45(1) that an appeal lies to a Full Bench only with the leave of the Full Bench. Section 45(1) confers a power on the Full Bench to grant leave and s.45(2) requires a Full Bench to grant leave if it forms the opinion that the matter is of such importance that in the public interest leave should be granted. The formation of that opinion dictates that leave be granted. Section 45(2) does not prescribe the test for the grant of leave. It requires the Full Bench to grant leave if the Full Bench forms the requisite opinion. The conventional considerations for the granting of leave including whether, in all the circumstances, the decision is attended with sufficient doubt to warrant its being reconsidered by the Full Bench, or whether substantial injustice would result if leave were refused, supposing the decision to be wrong, are not replaced by a different test: rather, s.45(2) provides a further, and obligatory, basis for the grant of leave."