Fluctuating electricity consumption

Have you set it up correctly with the right tariff input?

The only suggestion I can make is to start at the Consumer Unit to help narrow down the circuit. For example, you could switch off each MCB in turn until you find the 'offending' circuit. That will point you in the right direction. Turn the MCB back on and then systematically turn each item on that circuit off until you find the offending item. Some quick areas that are forgotten about but which cause consumption if left on but unnoticed: Loft lights Immersion Heater Outside shed/greenhouse heaters/lights It could also be indication of a wiring fault, e.g. water getting in an outside socket or deteriorating wire insulation - in which case, working out which circuit is affected will help the electrician find the problem. Good luck, hope you find it