9 The second defence offered is that the principal has a claim against the contractor under s 52 of the Trade Practices Act and that is a sum due which can be deducted under cl 42.10 from moneys due to the contractor under a progress certificate. The s 52 claim was first communicated to the contractor in a letter dated 9 September 1999. In summary, it is that at all times the contractor assured the principal that the works would be completed on time and without undue delay. Delays occurred and were apparent in the fifth week and later and on each occasion the contractor assured the superintendent that the construction programme would be met. Had the principal known that the contractor could not complete the works within the 10 week construction period, the contract would have been awarded to another tenderer. Had the principal known that later assurances from the contractor would not be met, it would have terminated the small lot part of the contract earlier than it did. The letter quantifies the loss and damage under various heads and the sums are: $114,952, $101,175, and $162,950.