In the first episode of Inside business we get to grips with the legislation and investigation of business in all its forms. This week we're discussing tax havens with a retrospective report on the last few years concerning tax avoidance. We also spoke with BBC World Service Business Reporter Howard Mustoe to get to grips with the report released last week from PricewaterhouseCoopers (PwC) which warns that the use of tax havens by companies and individuals to avoid paying tax will soon become "unacceptable."