Yuan Shui, a member of the Register of Chinese Herbal Medicine (RCHM) prepares a prescription with Chinese herbal ingredients at the Yuan Clinic in London February 16, 2011. An EU directive passed in 2004 comes into effect from May 1, 2011 which requires that traditional herbal medicinal products must be licensed or prescribed by a registered herbal practitioner. REUTERS/Stefan Wermuth (BRITAIN - Tags: POLITICS HEALTH)