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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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