Ocado Group saw its gross group sales increase by 15% in the 16 weeks to 29 November to £381.6m.

Its average number of orders per week rose by 15.8% to 205,000.

Overall for the 2015 financial year (52 weeks to 29 November) gross group sales were up by 17.3% to £1,204.4m.

Chief executive officer Tim Steiner said: 'We are pleased to report the thirteenth consecutive quarter of double-digit sales growth in what is a challenging and competitive grocery retail environment. Order growth remains strong with average orders per week now exceeding 200,000.

“This reflects the ongoing shift to online grocery shopping and the specific value customers place on Ocado's leading proposition, offering the highest service levels and widest range. Our basket value declined as we remain competitive by following market moves in pricing.

He added: 'We are committed to further improving our offer to customers and to driving operational and capital efficiency across the business, which we believe will support growth. We anticipate the retail environment to remain challenging, but expect to continue growing sales ahead of the online grocery market.'