Medical opinion evidence expressed in terms of possibility rather than probability is not necessarily insufficient to establish causation; such evidence must be assessed in context and in conjunction with other admissible evidence, including lay evidence. A plaintiff who defers obtaining an expert report for which legal aid has been granted, in order to pursue a conciliation process concerning a different defendant, may be found not to have taken 'all reasonable steps' to ascertain material facts for limitation extension purposes, even where the deferral was on solicitor's advice. The question of whether following solicitor's advice amounts to taking reasonable steps is a question of fact in each case.
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