Thirty-second things to try, picked for the devices you told us about.
Dropping the heating flow temperature on a combi boiler to around 60°C can cut your gas use and still keep the house warm. It takes a minute on the dial, and it's one of the biggest free wins in a UK home.
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Modern washing powder works perfectly at 30°C, and each cooler wash uses roughly a third less energy than a hot one. Hanging a load outside instead of tumble drying saves even more.
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Heating a big oven for one portion is costly. An air fryer warms up in a couple of minutes and uses far less electricity, so weeknight dinners cost noticeably less to cook.
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Walk round tonight and count what's glowing at 11pm: the telly, the games console, the microwave clock, the soundbar, the charger. One switched extension lead turns them all off together and trims your electricity bill.
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Written by people, checked by hand, and never sold on.