"For the purposes of this rule, the plaintiff's cause of action in respect of a debt or damages shall be construed as a cause of action in respect also of such interest as might be included in the judgment, whether under section 35A of the Act or otherwise, if judgment were given at the date of the payment into court."
"In any action for debt or damages any defendant may at any time pay into court a sum of money in satisfaction of the cause of action in respect of which the plaintiff claims ..."
"The operation of para.(8) will have the effect that the trial Judge may have to make a special calculation of interest at the end of the trial for the purpose of deciding whether the payment into Court was adequate at the time that it was made, in order to determine what order for costs should be made. Thus if the trial Judge awards £x by way of damages and the defendant has paid into Court £y, which exceeds £x, then a calculation may have to be made as to what the amount of interest would have been if judgment were given for £x at the date of the payment into Court. If such figure amounts to £a, and if £x + £a exceeds £y, the result would be that the amount recovered by the plaintiff will have exceeded the amount paid into Court by the defendant, so that the plaintiff will be entitled to be awarded the whole costs of the action. But it is thought that this calculation would not be very difficult and is likely to arise comparatively rarely."
"(1) This rule applies where at trial a claimant – (a) fails to better a Part 36 payment; ... (2) Unless it considers it unjust to do so, the court will order the claimant to pay any costs incurred by the defendant after the latest date on which the payment ... could have been accepted without needing the permission of the court."
"For the purposes of rule 36.20, a claimant fails to better a Part 36 payment if he fails to obtain judgment for more than the gross sum specified in the Part 36 payment notice."