Ocado has added an extra seven years to its supply deal with Waitrose, ­extending the arrangement to at least 2020.

The agreement had paved the way for a long period of growth, said Waitrose MD Mark Price.

"Waitrose and Ocado have worked well together for many years and are complementary businesses. We have a shared passion for high-quality food, outstanding customer service and great value."

Ocado CEO Tim Steiner added: "In areas where Waitrose and Ocado trade together, we have both grown significantly ahead of our competition."