On how he approached the project
"I didn't make this film because I am a documentary filmmaker. I made it because I'm just a normal person who didn't believe what I was hearing and seeing. When I was informed that there was going to be an inquiry, I wanted to get in very early, and I wanted to make the film that might confirm my suspicions."
"I didn't find this film very difficult to make - the film virtually made itself."
Is it a sensationalist film?
"I thought it was important that the public got to understand in a forensic manner what was happening in this inquest. I didn't want to make a sensational film - I don't think it is a sensational film. I think it's a very forensic analysis of the British legal process."
"He put money in because nobody else would. If I could have got it somewhere else I would have got it somewhere else. I didn't, I got it from him."
What's new in Keith's film?
"I don't believe that there is too much that is new... There's an old saying in our country - the best kept secrets are on the bookshelves of the British Library. They're all there, if you care to have a look. Now if you just take all the information, and you manipulate it or place it into a certain shape, then two and two start to make four - before you did that, two and two may well have made five. I've used the available information, and I've put it in a certain way. It's as simple as that."
Allen suggests a link between the monarchy and our ruling elite
"Now, look, let me make this absolutely clear - this is not an attack on the monarchy - it's actually questioning the role of the Establishment. And in so doing it will make clear that there are connections between the Royal House of Windsor and the Establishment. It's as simple as that."
What about that picture of Princess Diana dying?
"As I said when I defended the film, there won't be a sharp intake of breath when you see 'the photograph' of the princess dying, there won't be. You saw it and I don't believe there was. It's nowhere near as sensational or revealing as people made it out to be."
On whether he should have mentioned that the film was financed by Mohamed Al-Fayed
"I don't understand at which point in the film I could have said to the viewers, 'By the way, this was financed by Mr Al-Fayed'. I think it may have disrupted the flow of the film... I think you'll find there are an immense number of films coming out of America and all over the world that are financed by the Mafia... I presume that you're trying to imply that the presence of Mohamed Al-Fayed in some way informed the editorial process. I can categorically say that it didn't."
Is the ending of the film anti-royal?
"It's not anti-monarchy - I think it may be questioning capitalism."
Allen and Diana: The Last Days author Martyn Gregory have a heated exchange about the financing of the film
Martyn: "How much was not funded by Mohamed Al Fayed?"
Keith: "None of it"
Martyn: "So it was all funded by him?"
Keith is asked about Al-Fayed's absence from the press conference
"I'm not his keeper."
Was Keith tracked by the authorities while he made the film?
"I really think, my friend, that our secret services are so good that I wouldn't know."
Will he make lawyer-requested cuts to the film in order to secure a release in the UK?
"I haven't made any cuts of the 87 that were suggested, which is contributing to why the film isn't being show 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. 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 London Film Festival and it could be shown there."
"I do believe that Diana was in a position to rock a number of boats, I do believe that a warning may have sufficed. I remember with Mo Mowlam when she banged her head, they could easily report anything she said that had been contentious within the framework that Mo's mad. So I think there's a chance [Diana] may have survived the accident, they could argue that anything she said could be put down to a nasty crack on the head. I think it may have gone too far. I also believe that there is a cover-up about the presentation of evidence."
Is the royal family racist?
"I believe that to be the case, I don't think they're above racist comments."
What does he hope to achieve with Unlawful Killing?
"Maybe if the inquest had been conducted to my satisfaction... basically what I'm trying to do is to contribute to the world's wallpaper, I'm trying to add information. What I'm saying is do not necessarily believe the hype, that's all."
Did he ever meet Princess Diana?
"I haven't met Princess Diana but my son and my daughter have years ago. My ex-wife Alison produced a film called Hear My Song, [which was] chosen as the royal premiere. Bless his heart, Alfie, it was the first time he'd ever worn a suit... he was putting on his trousers and he did what you wouldn't wish upon all young boys - he caught his c**k in his zip. I had the awful job of having to unzip it and pull his penis out. I've got a wonderful photograph of Princess Di bending over talking to Lily and Alfie as they're presented to her and her just laughing. I wasn't there and I asked why [she was laughing] and my son told her he'd trapped his penis."
Why does his documentary not include any dissenting voices?
"I think that there are more than enough dissenting voices who'll watch the film... I'm not particularly interested in... I have to be very careful here... the film is a film from my POV. I think the French call it being an auteur."
Watch the Unlawful Killing trailer below: