Just when you thought the adult colouring book market was saturated

HARPERCOLLINS TO TAKE ADULT COLOURING BOOKS TO “THE NEXT LEVEL” HarperCollins imprint Harlequin UK is to launch a new series of colouring books for adults as the trend for the surprise-hit leisure pursuit shows no sign of diminishing. The Blank Colouring Book for Adults series will launch in July, a

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