Oasis warmly acknowledge their Irish roots in the long-awaited documentary about their meteoric rise to fame between 1993 and 1996.

Culminating in headlining Knebworth twenty years ago this year, Supersonic features footage from their Point Depot shows in 1996, an extract from an interview with Dave Fanning, and an appearance on The Late Late Show.

Band biographer Paulo Hewitt reflects, “Ireland really embraced the band as one of their own”. The Point shows are held up alongside Maine Road and Knebworth as historic Oasis gigs. Liam and Noel’s Mayo mother Peggy Gallagher, and elder brother Paul Gallagher, also contribute.

Noel expressed a reservation, “I don't want it to be a bunch of grey haired middle aged rockers talking about how good things were in the old days," so audio interviews narrate over old footage, making Supersonic feel very much in the present – while sometimes bizarrely coming across like a conversation between both estrange brothers.

Director Mat Whitecross, whose credits include The Road to Guantanamo, Spike Island and Sex, Drugs and Rock n’ Roll, has claimed there was more than enough footage to make Supersonic over seven hours long.

Whitecross did twelve interviews with both brothers and accumulated over 20 hours on tape with each Gallagher. “The caricature that persists is that Noel is the cold, calculating, talented one and Liam is the chaotic one, but I think there’s so much more to them than that,” Whitecross says. “I think there’s a lot of introspection in Liam. He’s incredibly perceptive about his own character and his weaknesses. He's got an amazing psychedelic mind and I think if you get in there some of the stuff he says is like poetry.”

Noel also admits he thinks Liam is better looking and funnier and wore better clothes. Supersonic will debut in cinemas on October 2, possibly with a live Q&A with Liam and Noel. The mind boggles…