Sainsbury's has announced that it will introduce a GBP100 million wave of price cuts this autumn.  Following on from a nine-month hiatus, the price war in UK grocery retail seems to be back on. Tesco announced price cuts last week and Sainsbury's has followed suit by announcing its own cuts on 5,000 product lines. But with a potential price war looming, non-price competition may be equally as important for Sainsbury's.