Exercise of rights of appeal from the Federal High Court or a High Court in civil and criminal matters
Section 243 · 1999 Constitution (2004 edition)
What Constitution says
Any right of appeal to the Court of Appeal from the decisions of the Federal High Court or a High Court conferred by this Constitution shall be - (a) exercisable in the case of civil proceedings at the instance of a party thereto, or with the leave of the Federal High Court or High Court or the Court of Appeal at the instance of any other person having an interest in the matter, and in the case of criminal proceedings at the instance of an accused person or, subject to the provisions of this Constitution and any powers conferred upon the Attorney-General of the Federation or the Attorney-General of a state to take over and continue or to discontinue such proceedings, at the instance of such other authorities or persons as may be prescribed; (b) exercised in accordance with any Act of the National Assembly and rules of court for the time being in force regulating the powers, practice and procedure of the Court of Appeal.
This is the 1999 Constitution as published in 2004. Later amendments aren't included yet, so a section may have changed since.
Original source
Official Gazette · CFRN 1999 official PDF · printed page 105–106. Original document
Release: draft-c8d50d87fae9. Source scope, review and corrections