The updated & restyled ADL Enviro400 known as the MMC & City were introduced by ADL from 2014. Both versions are also available as diesel-electric hybrids and these have the 400H designation. The City version was produced to meet specifications required by TFL for vehicles used on its network in London.

These models were Northcord's first new UK based tooling since the end of their association with Creative Master in 2012. The numbering system has also been slightly amended with a new N suffix for commissioned releases.
The first models were issued in early 2018 and like the original Enviro400 models (UKBUS6000) has been produced in several different variations:

1. 10.3 metre 1 & 2 door Enviro400 MMC and Enviro400H MMC
2. 10.3 metre 1 & 2 door Enviro400 City and Enviro400H City
3. 10.5 metre 1 door Enviro400 MMC
4. 10.9 metre 1 door Enviro400 MMC

The three models issued in the UKBUS006x series are all based on a real vehicle that is built to longer length of 11.5m, the models however use the longest available casting which is only 10.9m.

One interesting variation was the First Glasgow model (UKBUS6514) which was the first UK bus model to be issued with a depiction of a video based system that replaced the traditional rear view mirrors.

In early 2020 NMCL announced a new casting of the ADL Enviro400 "City" was in development, preparation of this new tooling has been delayed & is now expected to commence in the second part of 2022. These models will be issued in their own dedicated UKBUS6800 series.