Adult colouring in books - sales rocket to over one million at Sainsbury's
Colouring inside the lines has never been so popular, with everyday Brits and celebrities alike picking up their pens and turning to colouring books to unwind and de-stress. Zooey Deschanel and Nigella Lawson are amongst some of the celebrity fans of the crayon craze, which is known for its relaxing effects, ability to reduce stress and anxiety, and promote mindfulness.