Lord Greene MR was sitting with a strong Court of Appeal ( Scott , Mackinnon , Luxmoore , Goddard and Du Parcq , L.JJ.)
At page 725 Lord Greene said,

The Court of Appeal is a creature of statute and its powers are statutory. It is one court though it usually sits in two or three divisions. Each division has co-ordinate jurisdiction, but the full court has no greater powers or jurisdiction than any division of the court. Its jurisdiction is mainly appellate, but it has some original jurisdiction. To some extent its decisions are final (for example, in appeals in bankruptcy and from the county courts), but in the majority of cases there is an appeal from its decisions to the House of Lords either with the leave of the Court of Appeal or of the House of Lords. Neither in the statute itself nor (save in two cases mentioned hereafter) in decided cases is there any suggestion that the powers of the Court of Appeal sitting with six or nine or more members are greater than those which it possesses when sitting as a division with three members. In this respect, although we are unable to agree with certain views expressed by Greer L.J…as will presently appear, we think that he was right in saying that what can be done by a full court can equally well be done by a division of the court. The corollary of this is, we think, clearly true, namely, that what cannot be done by a division of the court cannot be done by the full court.

In considering the question whether or not this court is bound by its previous decisions and those of courts of co-ordinate jurisdiction, it is necessary to distinguish four classes of case.

The first is that with which we are now concerned, namely, cases where this court finds itself confronted with one or more decisions of its own or of a court of co-ordinate jurisdiction which cover the question before it and there is no conflicting decision of this court or of a court of co-ordinate jurisdiction.

The second is where there is such a conflicting decision.

The third is where this court comes to the conclusion that a previous decision, although not expressly overruled, cannot stand with a subsequent decision of the House of Lords.

The fourth (a special case) is where this court comes to the conclusion that a previous decision was given per incuriam.

In the second and third classes of case it is beyond question that the previous decision is open to examination. In the second class, the court is unquestionably entitled to choose between the two conflicting decisions. In the third class of case the court is merely giving effect to what it considers to have been a decision of the House of Lords by which it is bound. The fourth class requires more detailed examination and we will refer to it again later in this judgment.

Edited for ease of reading.