Calderbank offers Calderbank offers are widely used by defendants in litigation. While the significance of a Calderbank offer is assessed under CPR 44.1, no formalities are set out in the CPR which need to be adhered to when drafting such an order, unlike a Part 36 offer of settlement. Calderbank offers are, essentially, a creation of contract law. Where an offer is silent as to the terms of payment it is, therefore, necessary to consider contract law. For further guidance, see Practice Note: Settling disputes—settlement offers (Calderbank, WPSAC and Part 36). Settlement and settling disputes In order for an agreement to be contractually binding: • it is essential that the acceptance is communicated to the offeror