Salad chain Tossed has begun trialling a prototype vending machine format in London’s Chelsea and Westminster Hospital.

Speaking at the Lunch! show, Tossed’s food and commercial director Angelina Harrisson, said the ‘robot’ technology “allows us to sell fresh healthy food 24 hours a day, without a shop attached to it”.

Harrisson said the introduction of self-service kiosks had seen average waiting time for its customisable salads reduce from nine minutes to three.

The project took two years to get from concept to launch, but now its biggest sites have more than 20 self-service kiosks, and the chain is currently working on version four of the software, she added.

The business has also just completed the roll out of workplace messaging app Yapster, which Harrisson said has replaced about 100 different workplace WhatsApp groups.