The late singer's father has made it very clear he's unhappy with the new documentary on his daughter's life, calling it a piece of fiction and blasting how aspects of her life and her relationship with Mitch are portrayed.
Speaking on today's ITV's Loose Women, Mitch confirmed that he is working on his own movie alongside Amy's former fiancé Reg Traviss.
"We're making an alternative film," he said. "We're going to invite everyone that's spoken on the other film and we're not going to edit it – like they've edited me – and we're going to tell the truth about Amy's life because this is not.
"My grandson who is nine months old is going to look at this – and he's a lovely boy – and he's going to say, 'Grandpa, what were you doing? What exactly were you doing?'
"If I went to see this film and I didn't know what happened, I'd also have a dim view of me. That's my point, it's not true."
The documentary, Amy, was made by Asif Kapadia, who previously made documentaries on the likes of Ayrton Senna.
Mitch said that although he disagreed with some aspects of the film, he wouldn't discourage fans from watching it.
"You've got to go and see the film because the first 45 minutes, you see film of Amy that is incredibly beautiful," he said. "It's absolutely incredible and I've got to say 'thank you to the guys' because if it wasn't for them no one would be seeing the movies [footage]. But there are other movies [footage] that people have got, that wouldn't give them to these people [Asif Kapadia's film]."
Mitch continued to say: "She had a lovely boyfriend, she had wonderful friends, she had her PAs, they're not in the film. They don't have a voice. Reg did six, seven hours of interviews, not in the film, I did dozens of hours of interviews and you hear my voice three times and what I say is misrepresented."
When asked if he felt he'd done anything wrong while Amy was alive, Mitch answered: "The one thing these people don't understand is the nature of addiction. If you do, you will understand how difficult it is. We made everything available for Amy. Treatment, psychoanalysis, in and out of treatment, left, right and centre, I can't tell you. The hours we spent trying, the family interventions.
"This nonsense about Amy being left on her own for the last three years of her life is incredibly insulting and it's insulting to families who are struggling with addiction, up and down the country."
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