Clothing shop displays at this time of year are centred around a winter fashion staple that will never go out of style: the humble woollen jumper.

But are the garments we assume to be wool really that? And will they have the associated benefits of being warm, durable and, for when it comes to it, biodegradable?

On a cold autumn day recently, I went into a British high-street shop to pick up a new hat. I found one in the chocolate brown shade I was after and didn’t look much further than the “With Wool” sticker on the tag before deciding it was good enough to buy.

On further inspection of its interior label on the bus home, I was surprised to discover that just 11 per cent of its composition was wool, with polyester making up 66 per cent and polyamide, acrylic and elastane accounting for the rest – all synt

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