"Where a claim is made against individuals relating to their probity of their competence, especially their professional competence, and the claim is for many millions of dollars, then it is not hard to infer that defendants against whom such allegations are made are under a heavy burden. When that burden is not merely deferred but then unjustifiably drawn out over many years, it is easier still to infer serious prejudice of the relevant kind to a defendant. It has sometimes been said that where a defendant is insured or likely to be insured then the prejudice is not so great and the risk of litigation has been said not to be so great in cases of compulsory insurance, such as that applicable to motor accidents, especially where the premiums cannot be increased if the plaintiff is successful. But where a claim extends beyond mere casual negligence to acts which reflect upon the competence or probity of a defendant, especially when that competence or probity is critical to the defendant's future livelihood, then the delay in bringing an action on for hearing will properly be held to impose severe additional prejudice on a defendant. This is particularly the case in claims alleging professional negligence, although such a description is not to be confined merely to the negligence of accountants, solicitors, doctors and the like for it is relevant to any person in respect of whom an unfavourable finding will be likely to place at risk his or her capacity to earn a living. No doubt this case, without delays, would have hung over the defendant's head for up to three years. We are, however, primarily here concerned with the additional and quite unnecessary
burden imposed in the later years while awaiting trial.
Thus, it is not so much the size of the claim as the effect on a person's reputation which is critical to prejudice of this kind. Nor are we suggesting that mere anxiety is sufficient, for that has been said to be a matter upon which too much weight should not be rested. See generally eg Duncan v. Lowenthal at 187-188, ANZ Banking Group v. Donovan at 13, Biss v. Lambeth Health Authority [1978] 1 WLR 382 at 389; The Chris Smaller (Transport) Case at 1208-1210."