3. The provisions of these Rules as to actions by or against firms shall apply to actions between a firm and one or more of its members, and between firms having one or more members in common, if the firm carries on business within Northern Ireland, but no enforcement proceedings shall be taken without leave of the judge, and on an application for leave to take such proceedings all such accounts and inquiries may be directed to be taken and made and all such directions may be given as may be just.