No spoilers because there's not really much to tell.
This is an EXTREMELY local dull and uninteresting tale about a West ham fan that thinks he's Tony Wilson. The anecdotes are boring, hyperbolic and you'd be bored if someone was telling you then down the pub.
The movie is described as a story about the most interesting influencer you've never heard of. You aren't missing anything. The people in this are very small names in the music industry with a local radio station. How did this get made?
I'm sure if you lived in this very small area of east London at this very small moment in time, then this is your trainspotting. But as someone who isn't I found this documentary really dull.