In NNPC v. FAMFA OIL LTD. (2012) 17 N.W.L.R. (Part 1328) S.C. 148, this Court, while faced with a similar objection to the grounds of appeal, went ahead to deal extensively with the criteria for identifying when a ground of appeal is one of law, of fact, or of mixed fact and law. Rhodes-Vivours J.S.C., at Pp. 175 – 176, Paragraphs C – H, as follows: “…. In Nwadike v. Ibekwe (Supra), this Court explained further that: (a) It is an error in law if the adjudicating Tribunal took into account some wrong criteria in reaching its conclusion. (b) Several issues that can be raised on legal interpretation of deeds, documents, terms of arts and inference drawn there from are grounds of law. (c) Where a ground deals merely with a matter of inference, even if it be inference of fact, a ground framed from such is a ground of law. (d) Where a tribunal states the law in point wrongly, it commits an error in law. (e) Where the complaint is that there was no evidence or no admissible evidence upon which a finding or decision was based, same is regarded as a ground of law. (f) If a Judge considers matters which are not before him and relies on them for the exercise of his discretion, he will be exercising same on wrong principles and this will be a question of law…..”
APPEALING MIXED LAW AND FACT REQUIRES LEAVE OF COURT
Where the law or rule prescribed the procedure to be taken in the performance of an act is not complied with, the performance of the act in the circumstance is a nullity. Section 233 (3) (a) provides that subject to the provisions of “Subsection (2) of this section, an appeal shall lie from the decisions of the Court of Appeal to the Supreme Court with leave of the Court of Appeal or the Supreme Court.” In other words, a party desiring to appeal the decision of the Court of Appeal to the Supreme Court on mixed law and facts or facts is required to obtain the leave of the Court of Appeal or the Supreme Court to file the notice and grounds of appeal.
— W.S.N. Onnoghen, JSC. SPDC v Agbara (2019) – SC.731/2017(R)