J Sainsbury lost 9 1/2p to 277 3/4p, as its share of the intensely competitive food market declined. Tesco, down 6 1/4p at 235p, is expected to be barred along with Wal-Mart-owned Asda, leaving Wm Morrison, down 6 1/2p at 220p, free to mount a bid. However, billionaire retail entrepreneur Philip Green could be in the running.