There were a number of companies presenting at this week's CAGNY conference in the US that had recently-installed CEOs making their first appearance at one of the key dates in the investor calendar as chief executive. Among them was Steve Cahillane, the former Anheuser-Busch InBev and Coca-Cola executive who took the helm at Kellogg in October. His job is to get a business with a sluggish top line back into growth. Dean Best tuned in.