In solicitor's negligence cases alleging failure to advise, causation turns on the subjective state of mind of the client — whether they would have acted differently if properly advised — not on an objective test of what a prudent client would have done. A trial judge may rely on events occurring after the alleged breach as evidence of the client's state of mind prior to the breach, for the purpose of evaluating credibility. It remains an open question whether the reversed evidentiary onus applicable in medical negligence warning cases extends to solicitors' negligent advice.
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