LONDON, Sept 18 (Reuters) - British supermarket group

Asda said on Wednesday its chairman, veteran retailer Stuart

Rose, will assume the executive responsibilities of co-owner

Mohsin Issa who is stepping back from his leadership role.

Rose will work alongside Rob Hattrell, a partner at private

equity firm TDR Capital, who was already a director on Asda's

board.

Asda is owned by Issa and TDR Capital, while U.S. giant

Walmart ( WMT ) holds 10%.