An expert opinion that is an inexact estimate drawn from experience, rather than a precise measurement, is not thereby inadmissible, though it may be contestable on weight. The falsification of one assumption underlying an expert opinion does not necessarily render the opinion inadmissible where the opinion is not solely directed to that assumption. Findings made in relation to a claim that is subsequently dismissed are obiter dicta and do not give rise to issue estoppels. A court exercising a costs discretion may not cap costs by reference to an arbitrary view of what sum the plaintiff should retain from the judgment.
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