US retail giant Wal-Mart has said that its UK supermarket chain Asda recorded a low double-digit rise in same-store sales, excluding petrol, in the fourth quarter.  Including petrol sales, Asda's same-store sales rose in high single digits in percentage terms. Asda said the number of customers visiting its stores increased by 800,000 over the year, totalling 9.4 million customers a week.