MAIL ONLINE: Why the winter sun can still leave you GLUM: Enjoying the unseasonal warmth? The bad news is it won’t give you a vital vitamin D boost

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‘To make vitamin D, you have to expose unprotected skin to UVB light,’ says Professor Ann Webb, from the Centre for Atmospheric Science at the University of Manchester.

‘But from October to March, the sun [in Britain] is so low in the sky that most of the UVB rays get lost in the atmosphere. So, even if you’re in the sun, you won’t get the UVB light you need to make vitamin D.’