After a shocking announcement this morning, revealing a A 250 million overstatement in first half profits, Tesco has suspended senior executives, called in Deloitte to investigate and alerted the UK's main finance regulator. Lewis has been in retail with Unilever and Tesco for nearly three decades, so the fact that he has never seen such an issue is a brutal indictment, confirming that this isn't some sort of run-of-the-mill mistake.