What the hell is this? Seriously it's like outsider art of something.
It looks like the guy watched TV and internet for years and added every popular meme he saw to the mod. It just looks utterly unintelligible! I wish I could download it now.
It's based on every ridiculous thing that happens in Britain while it's being made. It'll probably only be released once it reaches the engine's limits, because Britain won't stop Britain-ing.
The music in this video was composed for the mod by Lee Jackson, the composer of the Duke Nukem theme: https://leejackson1.bandcamp.com/track/double-decker-chase