A hunch about Online gambling has made Denise Coates from Bet365 Britain's best paid boss. Chris Bowlby discovers how this elusive figure from Stoke masterminded a global betting revolution. We follow her career from the tough world of 1990s betting shops to today's lucrative round the clock business. But why has hardly anyone - even in her home town - ever heard of her?

Producer: Smita Patel
Editor: Emma Rippon.