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Earlier this month Martin Lewis outlined a '4pm rule' that UK households should follow during colder temperatures, and now Octopus Energy has given it their seal of approval.

The finance expert's advice is simple: with sunset occurring at 4.14pm today, his MSE team is recommending people draw their curtains around 4pm.

Martin explained: "When the sun is shining, it is letting light and heat into the house, so you want the curtains open.

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"When it gets dark, it's not, so you want to keep the heat in by closing the curtains."

The MoneySavingExpert,com founder added: "When the sun is shining, it is letting light and heat into the house, so you want the curtains open.

"When it gets dark, it'

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