Diageo’s new boss Dave Lewis is set to outline details of a much-anticiapted shake-up that could mean job cuts this week. After much speculation, the former Tesco chief executive - known as ‘drastic Dave’ - will provide some clarity on his strategy at the group’s capital markets day on Thursday (6 August). 'Drastic' Dave is expected to outline details of a shake-up that could mean job cutsShares are up 2 per cent this year, but down by more than 50 per cent over the past five years. Analysts expect annual sales to have declined by 2.1 per cent to £14.5billion, blaming weak demand in the US. Despite weak spirit sales in the US and Latin America, demand for Guinness, which has gained traction among young women, has been booming.