Media playback is unsupported on your device

Dave Lewis takes over as boss of Tesco

1 September 2014 Last updated at 11:48 BST

Dave Lewis is taking over as chief executive of Tesco a month earlier than planned.

He joins the UK's biggest retailer as it has been losing market share and sales have fallen.

Retail analyst Steve Dresser who has been watching the firm closely, considers what Dave Lewis will need to do for the company.