The double-decker variant is mainly built for use in the United Kingdom, and was initially available both as an integral product known as the Scania OmniCity, and as a separate chassis with Alexander Dennis Enviro400 bodywork.

[citation needed] The N230UD is the best selling variant of the N-series chassis, with Stagecoach in the United Kingdom being the largest customer.

This also marked the official end of the double deck variant of the Scania OmniCity.

[citation needed] A gas-powered double-decker variant of the N-series chassis, known as the N280UD, was launched with Enviro400 MMC bodywork in 2016.

Reading Buses was the first customer of the United Kingdom's first ever gas-powered double-decker bus.