Top up passive heating using green tariff electricity directed to where it is needed.
Radiant heat is key to this especially for larger spaces. We feel warmth reflected from the clothes we wear and from the air against our skin but also radiating from heaters and the warmer surfaces around us. Raising air temperature is not the most efficient way to feel comfortable. Enormous amounts of energy are wasted heating air when it is usually only people that need warming.
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Heaters should be close up to where you sit. 
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Save up to 95% electricity and water by using an electric shower and the drench, soap, rinse technique.
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Make sure heaters are controlled by those needing the heat rather than by electronics.
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Timers can be used to switch off heaters every hour or two. People can turn them on again if necessary but they won’t be left on for so long by mistake.
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Take a hot water bottle to bed and use a high tog duvet and/or blanket.
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Have a blanket by each chair in the lounge.
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Smaller heat pads are available for chairs.
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A black desk and keyboard radiating heat from a heat lamp can keep your upper body warm for very few Watts.
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If you sit at a desk for long periods consider using an electric heated foot warmer.
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Use an electric kettle to wash up and heat only as much water as you need.
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Switch to energy saver light bulbs but don’t break them as they contain mercury.
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Use only one light at a time, switching them off as you move around the home.
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On particularly cold evenings switch off your heaters and go out or invite friends around so they can share your heat.