Waitrose has added freshly-made sushi to its rapid delivery service, which has been extended from eight to 12 London postcodes.

Under the trial Waitrose Rapid Delivery service, which launched last September, customers can receive their grocery deliveries within two hours of ordering.

The addition of sushi to the service means Waitrose is the only national supermarket currently offering made-to-order sushi with same-day delivery, the retailer said.

The average number of orders through Waitrose Rapid Delivery has grown weekly by 20%, with sushi one of the most requested products to be made available through the service.

Since introducing freshly-made sushi into its stores in 2015 through its partnership with Sushi Daily, Waitrose has added 86 sushi counters and plans to add more counters later this year.

Waitrose & Partners concessions manager, Kelly Gleeson, said: “The quality and freshness of the products available from the Sushi Daily counters has really excited customers with the counters becoming an integral feature of any shop we’ve added them to - and now we’ll be the only supermarket delivering that experience direct to customers’ home or workplace.

“We’ve not only seen sushi sales increasing over time but a shift in when customers are buying it. While traditionally a lunchtime option, it’s become increasingly popular throughout the day. Waitrose Rapid Delivery gives us even more flexibility in meeting our customers’ needs.”