John Lewis is to invest a further GBP11 million in food eTailer Ocado. Ocado, which trades under John Lewis' Waitrose supermarket brand name, hopes to capture some of the 5.4% of total grocery sales expected online by 2005. But Waitrose may find it hard to challenge Tesco's enormous success in the market, especially as it has opted for expensive independent warehouses in contrast to Tesco's cheaper in-store picking.