The test of whether rejection of an offer was imprudent or plainly unreasonable, applicable to Calderbank offers, does not apply to formal offers made under Part 5 of Chapter 9 UCPR; r 360 operates on its own terms and should not be circumscribed by the Calderbank test. In the absence of evidence of prevailing commercial interest rates, the rates prescribed for default judgments under r 283 UCPR are generally accepted as satisfying the need for compensation at ordinary commercial rates and should be applied. Where both parties benefit from a mid-trial adjournment by remodelling pleadings and gathering evidence, the adjournment period should not be excluded from the pre-judgment interest calculation.
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