LONDON, ENGLAND - DECEMBER 04:  Formula 1 World Champions Mika Häkkinen, McLaren Hondas Jenson Button pictured alongside Diageo Global Brand Director Guy Escolme, Andrew Cowan, Managing Director for Diageo GB, and Radio Xs Chris Moyles at the launch of the Johnnie Walker® festive responsible drinking initiative Join The Pact outside Wembley Stadium on December 4, 2015 in London, England. The F1 stars were in London to encourage people to Join The Pact by pledging to never drink and drive. Those who sign-up will also have the opportunity to gift a friend a safe ride home this festive season. Join The Pact by visiting or by tweeting #JoinThePact to @JohnnieWalker_.  (Photo by Christopher Lee/Getty Images for Johnnie Walker)