Asda appoints David Potts as new CEO amid sales struggles

• David Potts, former Morrisons CEO, appointed as Asda's new CEO.
• Allan Leighton steps down as executive chair, moving to a non-executive strategic role.
• Asda, the UK's third-largest supermarket, continues to face challenges with sales and market share.
• Potts' appointment takes effect immediately.
• Asda has been experiencing falling sales, mounting losses, and a decline in market share.