A light-hearted look back at 15 years of the business challenge over 6 episodes, beginning with some of the most unforgettable candidates. These are the wheeler-dealers, the walking egos, the sharp-suited entrepreneurs and the jokers who make the show what it is - from the sales patter of Paul back in series one and tenacious Ruth Badger 12 months later, right up to the barrow-boy banter of Thomas last year.