Is it cheaper to leave central heating on in winter if you go away?

Our house took two days to heat up with the radiators on after we left it for a weekend

Every week a Guardian Money reader submits a question, and it’s up to you to help him or her out – a selection of the best answers will appear in next Saturday’s paper.

This week’s question:

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Source: the guardian
Is it cheaper to leave central heating on in winter if you go away?