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From Farrah Fawcett’s feathered cut that was often styled into large, bouncy curls to long, shaggy curtain bangs that skimmed your eyelashes, hairstyles in the 70s have always been iconic.

Sam Rubinstein, founder of London-based Rooibos salon, tells me that, right now, the curtain crop is one of their “most requested haircuts”. But, they say, “No one ever knows what to call it – a ...