Jesus. Mind if I ask what kind of house you're in? Our IHD was showing about £2.80 as I left this morning and that included electricity for a bit of car charging, running a 1kW electric radiator for four hours, and gas for heating which had been on for an hour aiming for 19C and my partner had a quick shower.
It's a 3 bedroom detached about average size at 1000sqft. The problem is the house is terrible for retaining heat. It Seems to lose 1 degree per hour if you turn the heating off. Im waiting for the grants so we can get cavity wall insulation.