@Beerlover The costs shown on the display are supposed to be the same as your energy tariff details, so they should include the daily standing charge. Often the tariff details are wrong and the costs on your display may not be the same as your bill calculation which is worked out on the SP computer. The display costs should be seen as a rough idea of costs.
@Beerlover Thanks for making the reply a solution. SP can certainly confirm that. The display is just a version of your costs calculated locally. The customer service agents are good but not all are aware how the smart system works in detail. The other aspect is the display does not send any data, so if it fails you can turn it off and the meters will continue to connect successfully. The meters only record kWh and m3 and have no cost data, all the cost data for your bill is calculated centrally by SP. The costs calculated by the display are supposed to reflect your tariff, which is supposed to be regularly updated, but this is the weakest aspect of performance and is often not updated. You can trust the kWh and m3 data but not the costs on the display.