Discount Retail Chain Lidl UK's finance chief has quit as the German-owned discounter struggles to achieve profitable growth. Marco Di Costanzo is leaving after two years in the role. It is understood he will be taking up another post in the Schwarz retail empire that owns Lidl once a successor is named in the New Year. His departure comes as experts predict another bumper Christmas for Lidl as it pursues an aggressive expansion plan. Lidl has nearly 1,000 stores and is closi