In any suit in which it appears to the Court that any substantial question as to the interpretation of constitutional law is involved, the Court shall not proceed to determine that question until after notice has been given to the Attorney General for Bangladesh if the question of law concerns the Government 3[* * *].
The Court may at any stage of the proceedings order that the Government shall be added as a defendant in any suit involving any substantial question as to the interpretation of constitutional law if the Attorney General for Bangladesh 4[***] whether upon receipt of notice under rule 1, or otherwise, applies for such addition is necessary or desirable for the satisfactory determination of the question of law involved.
Where under rule 2 Government is added as a defendant in a suit, the Attorney General 1[* * *] or the Government shall not be entitled to or liable for costs in the Court which ordered the addition unless the Court having regard to all the circumstances of the case for any special reason otherwise orders.
In the application of this Order to appeals the word "defendant" shall be held to include a respondent and the word "suit" an appeal.]