Three weeks ago at the annual meeting Mr Broadbent backed Mr Clarke, who later said he was "going nowhere", but will now step down on October 1. Already lined up in the wings was his successor, unveiled yesterday as Dave Lewis, 49, credited with revamping a succession of businesses at consumer goods group Unilever and currently its global president of personal care. Tesco shares topped the FTSE100 leaderboard in early trade and finished ahead by almost 1.3 per cent, up 3.65p at 288.65p. Shore Capital's Clive Black, who upgraded his rating on the stock to hold from sell, said: "A material change in UK trading strategy cannot be dismissed, which is likely to have considerable implications for the rest of the British sector." The shares of rivals Sainburys fell 6.7p to 318p while number four player Morrison's was down 4.1p at 173.9p. The coup came as Tesco issued another profits warning.