"Subject to rules of court, in proceedings (whenever instituted) before the High Court for the recovery of a debt or damages there may be included in any sum for which judgment is given simple interest, at such rate as the court thinks fit or as rules of court may provide, on all or any part of the debt or damages in respect of which judgment is given or payment is made before judgment, for all or any part of the period between the date when the cause of action arose and – (a) in the case of any sum paid before judgment, the date of the payment; and (b) in the case of the sum for which judgment is given, the date of the judgment." (a) in the case of any sum paid before judgment, the date of the payment; and (b) in the case of the sum for which judgment is given, the date of the judgment."