An insider reveals: 'The film is going to cover every cough and spit of how the brothers went from being sworn enemies to being Britain's biggest band again – and then as close as ever.

'The camera crew captured the moments when the discussions started, and that first meeting to discuss the potential of a reunion.

'People who have seen it say that the footage is incredible and the sit-down interviews are very moving, powerful and have the pair displaying real emotion.

'However, the subject of Sara and the problems between her and Liam, as well as her and Noel, are being cut. There is a binding legal agreement which permits neither party from discussing one another in media projects – and certainly not disparaging one another. 

'That is the point where the lawyers and managers take over from the filmmakers and producers.

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"But very quickly it evolved into something far more personal and reflective. Beneath all the swagger and mythology, the documentary is really about two brothers who have spent years locked in conflict trying to figure out whether they can move forward without repeating the mistakes of the past.

"Disney executives apparently see that emotional dimension as the thing that could make the film resonate beyond music fans and connect with awards voters. They believe themes like family, ego, resentment, forgiveness and the passing of time are universal enough to give the documentary genuine Oscar potential.