The film is due to be premiered at Cannes Film Festival next month, and now, Reg has shared his worries - just days after the Winehouse family made the decision to disassociate themselves from the project.
Speaking to the Mirror, Reg explains: “I’m concerned about the way Amy is portrayed. There is a need to be truthful.
“They interviewed people very close to Amy but it would seem those accounts, having seen it, were put to one side in favour of a lazy journalistic portrayal.”
“A fictional film based on real life events gives you creative license but a documentary biopic is something quite different,” he continues. “There is a responsibility. A biopic is not a fiction, it is not something that can or should be censored.
“You must do two things - one is be completely impartial and the other is to be as truthful as you can possibly be.”
According to Amy’s father Mitch, Reg doesn’t feature in the biopic, despite the fact they were believed to be planning to marry.
“Only through extreme pressure have they put a few photographs of Amy and Reg in right at the end.
“Reg spent a lot of time with them talking about their relationship and everything else. Not to have Reg in the film is ridiculous.”
Last week, the Winehouse family explained their reasons for deciding not to support the film, in a statement issued to HuffPost UK.
“Fundamentally, the Winehouse family believes that the film does a disservice to individuals and families suffering from the complicated affliction of addiction,” the statement read. “By misunderstanding the condition and its treatment, the film suggests for instance that not enough was done for Amy, that her family and management pushed her into performing or did not do enough to help her.”
Asif Kapadia, who directed ‘Senna’, is behind the long-awaited doc, which charts Amy’s rise to success and the huge achievements she managed before her death in 2011. The ‘Amy’ premiere is still set to go ahead in May.