'I found out my brother was killed from the news - my story has now helped others'

Roger Park says the families "made history", by speaking out about flaws in the system.

"After their lobbying and campaigning, a lot of the protocols introduced in the aftermath of 9/11 were based on what they campaigned for," she says.

Airlines also benefited from their experiences.

"A lot of Pan Am 103 family members trained airlines on how to deal with victims," she adds.

Kathryn Turman, played in the series by Severance actress Merritt Wever, was head of the Office for Victims of Crime, for the US Department of Justice.

Turman arranged travel for family members plus secure closed-circuit viewing in the US, for the trial of two bombing suspects in the Netherlands, in 2000. The FBI notes this was unprecedented at the time.

Weipz adds: "We have victim services in the FBI, in the Department of Justice, in the US Attorney's office. Why? Well, because of Kathryn, but also because of the Pan Am 103 families."

Turman's character poignantly says in one of the episodes: "The families should have been protected and prioritised from the start... we can't make that mistake again."

The series is something of a jigsaw - we see the police and FBI painstakingly process thousands of fragments of evidence, in the build-up to Abdulbaset Al Megrahi being convicted over the bombing in 2001.

Two years later, Libyan leader Colonel Muammar Gaddafi accepted his country's responsibility for the bombing, and paid compensation to the victims' families.

The other pieces in the TV drama's puzzle focus on the lives of the people of Lockerbie and beyond, with volunteers stepping up to help traumatised families.

Weipz recalled one scene in the drama, where her father tries to reach a financial settlement for his son's death with the Pan Am insurance panel.

"That was one of the worst days of my life... hearing your brother really had no value because he was 20 years old, and was an assistant manager at a swim club and mowed lawns...

"Watching it, you see how horrifying it was."

We also see women from Lockerbie, who made endless cakes for the investigators, washed victims' clothes before they were returned to families and showed relatives the spot where their loved ones died.

"It was important to flesh out those emotional, human stories, to bring the Scottish stories to life," says Roger Park about the volunteers.

"They did such hard work and it wasn't their jobs, they were just locals who felt a moral obligation to help.

"Those women are just like my gran, I know those types of women, and I just think we rarely centre on those kinds of domestic stories.

"And what strong stuff you'd have to be made of to do what they did. I just love that they used the tools of their domestic lives to do such heroic work."

New York-based Michelle Lipkin, whose father Frank Ciulla was killed on the flight, speaks fondly about "the women who laundered the clothes", including Ella Ramsden and Moira Shearer.

"My mother was close to Ella and Moira, and we see Moira when we go to Scotland," she says.

"There's no words to describe the gratitude we have for them, because our loved ones were murdered.

"It's the most evil of evil, and so every piece of clothing they laundered, every meal they made for the searchers - that just brought back what is possible, and the human spirit and kindness."

Weipz also speaks about the "compassion" shown by the people of Lockerbie in the hours after the bombing.

"People slept outside with the bodies too. They didn't want them to be alone. It just overwhelms me at the times when I think about it," she says.

Scottish actress Lauren Lyle plays June, the wife of Det Sgt Ed McCusker, one of the lead Scottish police officers.

She says although the investigation was a "male-heavy story because it was the 80s", she also thinks "the women just stepped right up", often behind the scenes.

Lyle spoke to the real-life Ed McCusker to research her role, and says: "About five years ago, June got cancer, and she knew she was going to die. And she said to Eddie, 'One thing I want you to do is make sure you tell this story'.

"She sounded like a really formidable woman who held the family together, and I think she represents the people of Lockerbie."

Weipz adds: "Maybe people watching this will take some of the compassion they see, and pay it forward - we need some more of that in the world these days."