Ocado has reignited its feud with Sainsbury over which is the second biggest online grocery retailer after it claimed it would break through the 50,000 orders a week barrier by June.

Ocado trading and marketing director Neil Jewsbury said it was comfortably the number two after Tesco. Its average basket size was up £4 year-on-year this week to £105 with orders set to rise from 48,000 to 50,000 by the first week of June.

Sainsbury fulfils 48,000 orders with an average basket size of £90. However, its coverage of the UK is 78% compared with Ocado's 40%. A spokeswoman for Sainsbury said it was hard to see how Ocado could reach the level of orders it was forecasting.

Jewsbury said: "It's not just about orders. If you take our high basket value and our 100% delivery of what is ordered and multiply that by the number of orders, then we are ahead."

The row first kicked off last November, when Ocado called for Sainsbury to produce audited weekly sales numbers that were higher than Ocado's (The Grocer, November 5, 2005, p10).

Ocado won the Star Order gong in The Grocer 33's quarterly internet shopping survey last month,after it delivered all items. In contrast, Sainsbury substituted six items and failed to deliver one (The Grocer, April 22, p4).