Johanna Basford has sold 1.4million copies of her book Secret Garden . The trend for grown-ups colouring in is said to have started in US . Craze has spread across the globe with fans starting colouring-in groups . Experts say the pursuit allows those doing it to rediscover their creativity .
Johanna Basford has sold 1.4million copies of her book Secret Garden . The trend for grown-ups colouring in is said to have started in France . Craze has spread across the globe with fans starting colouring-in groups . Experts say the pursuit allows those doing it to rediscover their creativity .