A householder had noticed a drop in pressure in her unvented heating system. The boiler and storage cylinder were located in a garage and the pipework crossed an outside yard before entering the house. Her service contractor advised her that she has a possible leak.After contacting her Insurers, a local plumbing firm was contracted to discover the leak.  After considerable effort the plumber eventually discovered the source of the leak under concrete in the outside yard. An estimate was provided for the work to be completed and accepted by the insurance company. The plumbing contractor completed the works, however, he did warn his client that the water system was extremely old.After completing the works and successfully pressure testing the system, the plumber presented his invoice. The householder questioned the price, despite the invoice being approved and the monies paid to her by her insurers. She subsequently refused to pay the plumber. This went to the small claims court who required that a joint expert be appointed. Our investigations and our subsequent report concluded that in this case the plumber's costs were satisfactory.