"Everything must depend upon the facts of the particular case. But it is appropriate to consider what principles ought to guide the exercise of such a discretion. The basic principle, as it seems to me, is that the Court should take whatever course seems to be most conducive to a just resolution of the disputes between the parties, but having regard to the desirability of limiting, so far as practicable, the costs and delay of the litigation. Considerations of costs and delay may often support the grant of leave under subr (b); but, in my opinion, leave ought not be granted unless the Court is affirmatively satisfied that joinder is unlikely to result in unfairness to any party. Secondly, regard must be had to practical matters. For example, it would normally be inappropriate to grant leave for the joinder of applicants who were represented by different solicitors. There must be a single solicitor, or firm of solicitors, who is accountable for the conduct of the proceeding on the applicants' side of the case. Similarly, although all applicants might propose to rely upon some common, or similar facts, there may be such differences between the evidence intended to be relied upon in support of the claims of particular applicants as to make it inexpedient to join the claims. The discrete material may overbear that which is common to all the claims. Again, there may be cases in which the sheer number of the claims, if joinder is permitted, will impose an undue burden on the respondent; although it seems to me unlikely that this will be so except in cases where separate evidence is proposed to be adduced in support of individual claims. When the present matter was argued, a point which troubled me was Mr Clay's reference to some oral representations. Depending, perhaps, upon the number of such conversations, it seemed to me that these conversations might result in joinder proving unduly burdensome to the respondents. It might be one thing to require respondents to meet 114 claims which all depend upon the contents of three particular letters; it might be another thing altogether to require them to deal with a host of separate conversations involving individual applicants. However, when this question was raised, counsel for the applicant informed me that, if joinder was permitted, each of the applicants would be prepared to forgo any reliance upon the oral communications."