“… Lord Donaldson of Lymington MR gave valuable guidance in Halford v Brookes[1991] 1 WLR 428 , 443. He noted that knowledge does not mean knowing for certain and beyond possibility of contradiction. It means knowing with sufficient confidence to justify embarking on the preliminaries to the issue of a writ, such as submitting a claim to the proposed defendant, taking advice, and collecting evidence: "Suspicion, particularly if it is vague and unsupported, will indeed not be enough, but reasonable belief will normally suffice." In other words, the claimant must know enough for it to be reasonable to begin to investigate further. ”
“11 A similar approach is applicable to the expression "attributable" in section 14A(8)(a). The statutory provisions do not require merely knowledge of the acts or omissions alleged to constitute negligence. They require knowledge that the damage was "attributable" in whole or in part to those acts or omissions. Consistently with the underlying statutory purpose, "attributable" has been interpreted by the courts to mean a real possibility, and not a fanciful one, a possible cause of the damage as opposed to a probable one: see Nash v Eli Lilly & Co[1993] 1 WLR 782 , 797-798. Thus, paraphrasing, time does not begin to run against a claimant until he knows there is a real possibility his damage was caused by the act or omission in question.”
“21 There may be cases where the defective nature of the advice is transparent on its face. It is not suggested that was so here. So, for time to run, something more was needed to put Mr Haward on inquiry. For time to start running there needs to have been something which would reasonably cause Mr Haward to start asking questions about the advice he was given. 22 The judge made no specific finding about when that was in this case. The judge did express a view on a different question, namely, when Mr Haward first knew he had a "claim" against Mr Austreng's firm. On this question the judge held that Mr Haward had not discharged the burden of proving he first acquired this knowledge after6 December 1998 . 23 On the latter question the judge's reasons were subject to forceful criticism by Mr Haward's counsel. But that is beside the point. The relevant date was not when Mr Haward first knew he might have a claim for damages. The relevant date was an earlier date, namely, when Mr Haward first knew enough to justify setting about investigating the possibility that Mr Austreng's advice was defective. Mr Haward had the burden of proving that this date was after6 December 1998 . Mr Haward, it seems, did not attempt to discharge this burden. His evidence was not directed at this anterior issue. His evidence was directed at the date when he first knew he might have a claim for damages.”