LONDON, ENGLAND - AUGUST 06:  Members of the public walk past a branch of Boots the chemist on Oxford Street on August 6, 2014 in London, England. US pharmacy chain 'Walgreens', who previously owned 45% of 'Alliance Boots' has announced a 9 billion GBP purchase of the remaining shares in the company. Boots currently have 2,487 stores across the UK and employ over 60,000 people.  (Photo by Oli Scarff/Getty Images)