A Calderbank offer does not impose on the offeree the same onus as a formal offer of compromise under SCR Pt 22; it provides no more than a prima facie position. The ordinary party and party costs rule should only be departed from where the offeree's conduct was plainly unreasonable. Under s 131(2)(h) of the Evidence Act 1995, without prejudice communications are admissible on the question of costs even if they do not take the traditional Calderbank letter form.
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