Within two weeks of Jim coming back into her life, Rosa was pregnant.

What follows was traumatic. Jim did everything he could to isolate her from friends and contacts.

"He said we're going to be raided at any time. He stood over me while I had to pull out the pages of my address book that had activist content; all my memorabilia he said I couldn't keep any more.

"He kept saying, ‘You've got to change your name, you're going to be tracked you're going to bring people to me. You're going to be what hurts me’.

"I didn't want to take my name away, I wanted my name. And life had been weird enough as it was and I wanted normality back.”

One day, he came home with a filled out deed poll form.

"He stood over me saying I had to sign it if I wanted to see a doctor during my pregnancy which of course I did,” she said.

"I hated it and I didn't want to be called a name that wasn't my name.”

When she gave birth to their child, the name being used by the medical staff was the name he had given her.

"I gave birth with a woman saying don't you worry Gwyneth* (not real name), it's gonna be alright. I wanted to scream like don't f******* call me Gwyneth. I held the birth certificate afterwards looking for some kind of reality and I didn’t recognise a single name on it."

Despite Boyling having told her they would flee, they didn’t.

She collapsed at work during her pregnancy and was told by the doctors she had to stop working due to complications with the pregnancy. He was providing for her financially.

"I've never been in that position before and it was horrible. If I wanted an apple I had to ask him for the money for an apple."

At the time he said he was working for The Met in an office job because he said they had to wait for the coast to be clear for their escape to be successful.

She wanted to use the internet to get a message to people in her old world but his refusal made this impossible at this stage.

I'd been jettisoned into a nightmare world where nothing was real

He told her places she couldn’t go and people she couldn’t see.

"I wasn't allowed to tell anybody about anything about myself. I wasn't allowed to tell them my real name or anything about my life."

"So neighbours would ask what I did before I had children and I'd be like, 'Oh you know, a bit of this, a bit of that, how about you?' How about you tell me about yourself. I don't live like that.

"I don't know how to do not telling people about myself.

"I kept saying this isn't a normal life, we need to leave. I can't be here. You're still getting paid by the people you betrayed me through. I can't be here.

"He’d say there's nothing we can do, it's just for a while, just for a while. It's a normal life. I said, 'It's just not a normal life. We don't know anybody’.

"He said, you speak to people at the baby group and I said I can't tell anybody anything about myself. I said that's not a friendship if nobody knows anything."

Asked if she was glad he had returned she said: “I was desperate for some reality.

"I'd been jettisoned into a nightmare world where nothing was real.

"When he was in a good mood he told me that I was the most amazing person.

"I said, ‘But you say really horrible things’ and he said people do when they're having an argument, that's what people do.

"And then when he was being horrible I'd say ‘but you said I was a really nice person’. I have to say that because you're mad, I've got to placate you, haven't I?" he’d say.

Rosa gives a detailed account of Boyling’s behaviour. He told her they would leave for Wales, and she made arrangements but he came home and said I'm not going, “I’m staying for the pension”.

Four days later she discovered she was carrying their second child.

While pregnant, she made an escape with her daughter but was persuaded by a friend that she was acting irresponsibly and that she wasn’t thinking rationally. She agreed to return home with her daughter.

Rosa had long been thinking of trying to escape but was torn with anguish over the effect it would have on her children.

"I felt so guilty that I was going to be ripping my children away from having a roof over their heads and food because mummy couldn't sort it out.

"Mummy couldn't make sense of all this mess. Mummy couldn't make it right. I somehow had to make it right.

"He kept claiming that he was my partner and he was going to reappear but he was under this temporary stress because of having been undercover.

"In actual fact when I did leave and I looked back, the guilt I felt was for not having got my children out sooner."

We went to a registry office in ordinary clothes then we went food shopping

The power dynamic is hard for Rosa to explain, and hard to fathom. At different points, she tried to get help.

Women’s Aid did eventually help her escape, but when she initially contacted them, they thought they would be unable to keep her safe.

She believes Sutton was controlling her. In 2005, he told her it was her fault he hadn’t turned back to Jim Sutton because she hadn’t shown him the commitment needed to encourage him to do so.

So, he insisted they signed marriage documents, but what Rosa describes below isn’t flowers, cake and dresses.

"We went to a [London] registry office in ordinary clothes. The registrar explained that it wasn't legal because you have to have witnesses. He just stood and stared blankly until she said she’d get someone from over the road and got two women from the old people’s home over the road."

She explains how the registrar said that normally people take photographs, but she had to tell them how to pose.

"Then we went food shopping."

They did eventually move to mid Wales, but he failed to leave the police and commuted to London to continue his desk job.

"I still find that hard to believe," she says.

When they came to Wales, she took her birth name back.

"I said, ‘You promised me you promised me I could take it back."

"He was livid about it but there's nothing that he could do to stop it.

"I remember I got a letter just a piece of junk mail I think in the post but my name was printed on it and I just sat on the floor behind the door just stroking my thumb over my name and it meant so much."

Once back in Wales, her children were diagnosed with a degenerative genetic condition.

"Suddenly the focus had to shift onto them because this was really serious now they didn't have long," she says.

"His response to it was you know this isn't what I want to do with my life."

Rosa ultimately went into a women’s refuge in 2007. It would take until 2009 for her to achieve divorce from him.

"When the divorce came through I thought it would all be over. I was elated and thought I was starting my life again and that the abuse would end.

But like so many women, it wasn't like that.