PRINCIPLE STATEMENT

The court will not allow a party on appeal to raise questions not raised in the trial court or grant leave to argue new grounds not canvassed in lower courts, except where the new points involve substantial points of law (substantive or procedural) which need to be allowed to prevent an obvious miscarriage of justice.

RATIO DECIDENDI (SOURCE)

Per Ogundare, JSC (quoting Nnamani, JSC in Skenconsult Nigeria Limited v. Ukey), in Agbaje v. Adigun & Ors (1993) NLC-2751990(SC) at pp. 8–9; Paras B–D.
"It is clear that this court will not allow a party on appeal to raise a question not raised in the court of trial or grant leave to a party to argue new grounds not canvassed in the lower courts except where the new points or new grounds involve substantial points of law substantive or procedural which need to be allowed to prevent an obvious miscarriage of justice."
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EXPLANATION / SCOPE

This principle establishes the general prohibition against raising new points on appeal while identifying a narrow exception for substantial legal issues. The general rule requires that issues be raised and argued in lower courts before appellate consideration. This serves multiple purposes: (1) Fair notice—opposing parties must have opportunity to respond at trial level; (2) Full record development—trial courts can make findings and develop evidence on contested issues; (3) Effective appellate review—appellate courts review decisions on issues actually decided below, not hypothetical issues raised for the first time; (4) Preventing ambush—parties cannot withhold arguments to spring them on appeal if trial goes badly. The prohibition applies to: questions of law not raised below, factual issues not pleaded or proved, defenses not asserted at trial, and legal theories not advanced in lower courts. However, the principle recognizes a critical exception: new points may be raised where they involve “substantial points of law” and preventing their consideration would cause “obvious miscarriage of justice.” “Substantial points of law” means significant legal questions affecting the validity or fairness of proceedings: jurisdictional defects, constitutional violations, fundamental procedural errors, or legal principles going to the root of the case. “Obvious miscarriage of justice” requires demonstrating that: (1) refusing to consider the new point would result in manifest injustice; (2) the point, if accepted, would likely change the outcome; (3) the error is of such magnitude that it cannot be overlooked. The exception is narrow—mere advantageous legal arguments or alternative theories are insufficient. Courts balance: the general rule favoring issues raised below against preventing serious injustices from being perpetuated. Factors considered include: whether the point involves pure law (requiring no new facts), whether raising it below would have made a difference, whether it goes to jurisdiction or fundamental rights, and whether the opposing party would be prejudiced. The principle maintains orderly litigation while providing a safety valve for substantial legal errors that would otherwise go uncorrected.

CASES APPLYING THIS PRINCIPLE