"The court may order a person to be added as a new party if - "(a) it is desirable to add the new party so that the court can resolve all the matters in dispute in the proceedings; or "(b) there is an issue involving the new party and an existing party which is connected to the matters in dispute in the proceedings, and it is desirable to add the new party so that the court can resolve that issue."
"The applications before me are all founded on sub-paragraph (a). This confers a jurisdiction to order that a person be added as a party where it is desirable to add that party so that the court can resolve all the matters in the dispute in the proceedings. It is to be noted that, in contrast to sub-paragraph (b), there need not be an issue involving a new party and an existing party. Further, if this jurisdictional requirement is satisfied then the court has a wide discretion which it must exercise in the light of all relevant circumstances."