The director had previously claimed that his refusal to censor the film meant that it would not be broadcast in the UK.
Speaking at a press conference for the film in Cannes, Allen said: "I haven't made any cuts of the 87 that were suggested, which is contributing to why the film isn't being shown in England.
"When you want to screen a film in England you have to have insurance, and the only way to get insurance is to be lawyer-approved."
He added: "I could get lawyer approval if I made the 87 cuts, which I wasn't prepared to make.
"It's an ongoing process, there's a chance it may be seen in England. We're in talks with the [BFI] London Film Festival and it could be shown there."
> Keith Allen on his Diana doc Unlawful Killing
Watch the Unlawful Killing trailer below: