There’s a surprise round every corner in life. Last week I was listening to global brands talk about the future challenges of sustainability with an outside chance of becoming purpose-led.  Today I heard the story of an entrepreneur who has been running an entirely purpose-led business for 10 years.  Meet Hattie Hasan of Stopcocks: an energetic crusader for the right of people everywhere to have clean water.  And a woman plumber. You might think choosing to be a plumber and cracking the male dominated trade a big enough challenge for one lifetime.  But underlying the decision to train to become...