Includes interviews with Gail Rebuck (CEO of Penguin Random House), Sir John Hegarty (Founder of BBH) and Stuart Murphy (Director of Entertainment Channels atSky) Def: Spark (n) - an elusive moment when a new idea strikes that has the potential to transform the way you do business. Big or small, new ideas are the lifeblood of all successful businesses. They are responsible for higher profits, quicker growth...