Drivecor (Pty) Ltd, an electrical equipment manufacturer and supplier, entered into a contract with the respondent (City Power Johannesburg) to manufacture, supply, install and commission control panels for two electrical substations. Drivecor purchased electrical and electronic components from the appellants (Ukubona 2000 Electrical CC and ABB South Africa) for manufacturing these panels. The appellants had in turn acquired these components from various suppliers who had reserved ownership. Drivecor also subcontracted the first appellant to perform part of the work. At the time of Drivecor's final liquidation on 17 September 2002, the control panels were incomplete, some located at the first appellant's premises, and Drivecor had not fully paid the appellants for the components. The respondent had made substantial payments to Drivecor and claimed ownership of the panels by attornment. It was common cause that the appellants were not owners of the electronic parts as their suppliers had reserved ownership and had not been paid. The purchase agreements between appellants and Drivecor provided for payment of the purchase price in one lump sum on a future date.