More than 100 restaurants, including Busaba Eathai, HOP Vietnamese and House of Ho, have signed up with 1,800 diners downloading the app.

Robert Lynch, founder of CityMunch, said: “Our vision is to bring a new kind of price flexibility to the restaurant industry. Hotel rooms, air fares and taxi rides are all priced dynamically, and while restaurants operate very differently they face the same underlying problem of peaky demand and rigid supply.

“For the consumer, we aim to always be useful, no matter where you are or when you want to eat, we’ll ease the cost of great dining experiences. For restaurants, attracting customers during down-times makes it easier to cover overheads, easing the cost of doing business in London and keeping great places open”.

The app offers a percentage off the food bill for the entire table, no matter how many people are dining. Diners reserve a voucher on the app and show their phone to staff at the restaurant.