I am chairman of owners' committee for timeshare development of 11 apartments. All heating is electric night storage radiators and we are on a dual rate tariff. I've recently obtained half-hour meter reports from the electricity supplier and noticed a metering/billing anomaly. The night rate period is 0000-0700 daily (I believe this is standard). When I look at the HH report, consumption in the final HH period each day (2330-2400/000 jumps significantly, clearly showing that the heaters are energised at 2330 (day rate) instead of 0000 (night rate). My question is - what switches the night-rate circuits? Is there a central time clock for the development that is on the "consumer side" or is there a time switch installed and owned by the DNO or electricity supplier?