Dynasty diva Joan Collins is 80, but she’s not slowing down just yet. Sophie Herdman looks at her new book, Passion For Life.[divider]

The phone rings and a man picks up – unless she has just eaten a Snickers bar, this is clearly not Joan Collins. In fact, it’s Percy Gibson. Husband number five. He passes her the phone.

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“You know what they say: ’You’ve got to eat life, or life will eat you’.”

“I’m getting a bit of a sore throat so forgive me for being a little croaky,” she says.

As ever, Collins, whose father was Jewish, is extremely busy, and she’s been struggling to sleep due to the building work going on at her London flat. ”It’s hard to find a little nook that one can go into without bumping into someone,” she notes.

Among her current projects, there’s a new autobiography Passion For Life, two films, a cameo in TV series Benidorm, a novel, a big secret project, (you’d never guess this woman is 80) and she’s due to perform an updated version of her one woman show, which Gibson directs.

He is wonderful to work with, she says. And according to her new autobiography, he’s also a wonderful husband. So what does Collins, with her wealth of experience, believe is the key to a happy marriage?

“Giving each other space and being best friends,” she states. ”Oh – and trying to have separate bathrooms.”

Collins is not really one for giving advice, though, and she certainly does not tell her three children how to conduct their relationships. ”If someone asks what I think of their boyfriend, I will say, but I don’t arbitrarily go about giving advice. I hate people who do that,” she says.

When she wants advice, she turns to her husband, and occasionally her younger sister, writer Jackie Collins – but only ”up to a point”. Family is clearly very important to her.

The first chapter of Passion For Life is dedicated to the topic. Collins’s mother was a dance teacher, her father, Joseph, a South African-born Jewish showbiz agent for the likes of Shirley Bassey and The Beatles – though she describes him as unemotional.

”He wanted me to go to secretarial school, find a good husband, have children and lead a nice, proper life. “It wasn’t quite my cup of tea,” she says wryly. He told her she’d be washed up by 23 if she became an actress, but his comments just made her more determined to succeed.

“I took some small pleasure in showing him that it didn’t happen the way he thought it would – that I was able to make a living as an actress, which very few actors can do all their life, and write books and support three children,” she says. ”I feel I’ve achieved quite an amount in my time.” Her father did give her some good advice, though: No one will ever do anything for you, so do it yourself.

“He was right, there,” she says. “I found myself in very deep trouble with the tax man.” That’s not the only setback the actress has experienced during her life. There were four failed marriages, of course, starting with Irish actor Maxwell Reed (whom she married aged 19; it lasted four years), followed by Jewish actor Anthony Newley, who was unfaithful.

Next came American businessman Ron Kass, and finally pop singer and playboy Peter Holm. This was the shortest marriage, lasting barely two years.

Collins also suffered heartache when her daughter Katyana, then aged eight, developed a severe brain trauma and was left fighting for her life following a car accident. Thankfully, she lived to tell the tale. The actress was once also embroiled in a high-profile legal battle with publishers Random House.

But there have also been many high points. She started working professionally in her teens and was quickly signed to Twentieth Century Fox, landing her big Hollywood break with a role in 1955’s Land Of The Pharaohs.

Film and TV roles continued throughout the Fifties, Sixties and Seventies, including two films based on novels by her sister – The Stud and The Bitch. From 1981 to 1989, she starred as scheming diva Alexis in Dynasty, which earned Collins a Golden Globe.

In 1997, Collins was awarded an OBE for her contribution to the arts and charity work. She’s a big fan of the Queen. ”I think she is the most inspirational woman – becoming Queen at the age of 25, she has never put a foot wrong. I think she’s absolutely brilliant,” she notes.

Her first four marriages may not have lasted, but Collins doesn’t see them as complete failures. Without them, she wouldn’t have had her three children – Tara and Alexander, whom she had with Newley, and Katyana, by Kass. She’s also at the time of her life where she can enjoy her three grandchildren. ”I enjoy my grandchildren, but do I enjoy being a grandmother? What does that mean? Sitting around making woollen hats?” she says, laughing.

Indeed, it’s hard to imagine an 80-year-old – who can still do the splits – doing anything remotely ’granny-ish’. But Collins is not really one for slacking and admits she has no plans to slow down. ”I can’t think of anything more horrendous than getting up and the only thing I have to look forward to is watching TV.

“No, I’ll always be doing something,” she adds. ”You know what they say: ’You’ve got to eat life, or life will eat you’.”

Passion For Life, published by Constable, is priced £25 and available now.