When Sir Ridley Scott heard of the allegations surrounding Kevin Spacey, he knew he had to come up with a solution or wave goodbye to his latest film, All The Money In The World.

IF directorial awards were given out to those who have achieved the impossible, South Shields-born Sir Ridley Scott would surely be a front runner. For within an hour of learning of the sexual harassment allegations surrounding Kevin Spacey last October, he had not only taken the decision to axe the actor from his latest film, but recast his role.

"I knew if I didn't do something, there would be a question of cancelling the film," he says in reference to All The Money In The World. "It wouldn't happen immediately, it'd gradually die and someone would say, 'Maybe we shouldn't run it, we should edit?' I was saying, 'No you can't edit, you can fix this!' "

That "fix" would require Sir Ridley to recall A-listers Michelle Williams and Mark Wahlberg, recruit Spacey's replacement in Oscar-winner Christopher Plummer and re-shoot all of his 22 scenes in just nine days.

That was just six weeks ago. Today, the crime thriller, which follows the infamous kidnapping of 16-year-old John Paul Getty III (Charlie Plummer) and the desperate attempt by his devoted mother Gail (Michelle) to convince his billionaire grandfather (Christopher) to pay the 17 million dollar ransom, is wowing audiences worldwide.

Of 88-year-old Christopher jumping on board, Sir Ridley says: "He was always there, and I think he thought it'd never happen because I was thinking about him when I was going to do Gladiator as well, and it went to Richard Harris.

"The reason I went with Kevin was Kevin is in his 50s," he reveals, elaborating: "There's a lot of make-up in the mornings, big make-up, prosthetics, three and a half hours of it. The film is pretty challenging, there are a lot of scenes, a lot of dialogue, so I went with youth. Wrongly."

If anyone should know age doesn't account for everything, however, it's Sir Ridley. At 80 years old, the Blade Runner director - who is tipped for success this awards season - is far from slowing down.

"It's easy for me," admits Sir Ridley, whose breakthrough came with the science-fiction horror film Alien in 1979. "I think it's genetic, it's in my DNA. My mum brought up three boys; she did good."

He credits that same upbringing in South Shields, and his mother specifically, for the respect he has for women. Both in and out of the workplace. "I get on with women," he says, simply. "I love women, and respect, I think, goes with it hand-in-hand."

Of years of casting film stars, he adds: "I don't differentiate. It's horses for courses, whatever the part is. Is it male? Is it female? I don't really separate that, because there's some great female actresses and there's some great actors out there. I think a change is as good as anything."

He reminisces over what he calls his "courageous movies" - take Alien, for example, in which he cast Sigourney Weaver as the star.

"I was sitting in the office one day with Alan Ladd Jr and we had the script and we're looking at Ripley, and Al said, 'You know, what happens if it's a woman?' I said, 'Dude, let's find an athletic woman. Why not?' And we just did it. I didn't ever think of the repercussion of the importance of what that meant, because gradually during the process, she earned her right and stripes as the survivor. She suddenly was this female action hero."

With his own daughter Jordan among the minuscule four per cent of female directors in Hollywood, he must believe there's still a way to go. "I like to think you've got to come up with a story," he says, resolute. "I am from West Hartlepool College of Art and I come up with a f****** story and I get the f****** film made. By the time I did a film I was 40, so it was really hardcore getting there," he notes. "I was very successful as a commercial maker - awards all over the place. But in those days Alan Parker, me, Adrian Lyne couldn't get into the film industry. So eventually I just went off and wrote three screenplays. "'m not a writer, but I wrote three pretty good screenplays and then finally had enough money to be able to afford to pay a writer, so I started financing my own projects."

The rest is history.

As for the wider sexual harassment scandal engulfing Hollywood, Sir Ridley was recently quoted as saying it would usher in 'an immediate change'. But can he ever see such figures as Harvey Weinstein and Spacey re-emerging? "Never say never, I've no idea," he says with a shrug. "I'm sure Harvey will already have a go within a year."

All The Money In The World is in cinemas now.