UK online grocer Ocado claimed today (7 September) that it had continued its “strong sales momentum” in its fiscal third quarter, with sales up almost 30%.

Gross sales increased 29.5% to reach GBP126.5m (US194.4m) in the 12 weeks to 8 August. Meanwhile, gross sales increased 29.8% in the 36 weeks to 8 August.

Ocado said average orders per week for the 12 weeks to 8 August reached 92,834, up on the 70,968 fulfilled in the same period of 2009.

However, the company’s average basket size fell around GBP1 to GBP113.59, which the company attributed to the impact of its Delivery Pass programme, which offers unlimited delivery for orders over GBP40 for GBP9.99 a month.

It said gross margins have remained stable, remaining at similar levels to those reported in the first half.

However, shares in Ocado were down 3.34% at 09:27 BST this morning to 151.75 a share, down from the 180p when the company launched its IPO at on 21 July.