The clash begins next March: Quinn Insurance v PriceWaterhouseCoopers (PwC). With a negligence claim of €900 million at its core the stakes are higher than any sporting battle and the courtroom confrontation will be keenly watched in business and professional circles. But first a preliminary matter has to be cleared up around the costs of the Commercial Court showdown, expected to be in the region of €30 million (possibly a conservative estimate). Given that Quinn Insurance Ltd (QIL) is a spent force, under administration, PwC wants the insurer to show, before the hearing begins, that it can cough up the…