Business school or school of life? An MBA from a top business school is what defines many of today's high powered CEO's - but is the qualification worth the cost or are would-be entrepreneurs better off learning business acumen in the real world? Evan Davis debates with guests. Guests: Colin Drummond, Chairman of Viridor and Harvard MBA graduate Kim Winser, former CEO of Pringle, now CEO of Winser London Glenn Sykes, Associate Dean of Chicago Booth Business School, London