Waitrose’s online grocery orders have shot up by more than a third since it relaunched its website.

Waitrose.com orders have risen 34.5% over the past year and last week sales were up by more than 50% year on year.

Despite well-publicised complaints about its usability, Waitrose claimed customers preferred the new site. The retailer said its net promoter score, which compares the number of supporters to detractors, was up 50%.

It added that its IT team continued to respond to customer complaints by making improvements to the site’s functionality.

“Our focus has largely been on developing the search and navigation functions of the website,” said e-commerce director Robin Phillips.