WHETHER it's the cult Brit flick Human Traffic or a clever cop show such as Life On Mars, John Simm brings a certain cachet to a project.

He oozes cool in person too, sipping on a Bloody Mary and rocking a black leather jacket and hipster-looking beard in a plush Cannes hotel.

Until, that is, talk turns to his favourite TV shows, and the 44-year-old reveals he's a huge Antiques Roadshow fan.

"I get a lot of stick for that," he confesses. "I don't know why I like it, it's just Sunday night TV . You know, you've just had your Sunday dinner..."

As for the beard - "it's not a mid-life crisis" - Simm has grown it for an upcoming ITV drama about Alec Jeffreys, the scientist who pioneered DNA fingerprinting.

But before that, there's new TV drama Intruders to promote. Simm stars alongside Oscar-winner Mira Sorvino in the gritty paranormal series, which has just aired in the US on BBC America.

The Leeds-born, Lancashire-raised actor plays a former Los Angeles cop in the show, about a secret society trying to chase immortality by seeking refuge in other peoples' bodies.

Simm's character Jack's world begins to unravel when his wife Amy (Sorvino) goes missing and a high school friend also turns up on his doorstep looking for help with a murder case.

"Nothing is as it seems in the show, nobody is as they seem," explains the actor, his enthusiasm for the project evident.

"Jack's sort of the hero; he's the audience's eyes.

"But he's kind of an anti-hero when you find out more about him. There's a dark side to him."

Playing a policeman is nothing new to Simm - he's been a time-travelling officer in Life On Mars, and a detective on the run in ITV thriller Prey. But cop-turned- author Jack is different.

For a start, there's his US accent. "You automatically think you can do an American accent because you've grown up with it.

"I was running around being Starsky & Hutch as a kid. Still am!" says Simm, who retains a soft Northern accent, despite years living in London.

"The guy that helped me with the accent, I got about two lines into it and he said, 'Let me stop you there'. So it's trickier than you think it's going to be, but I loved doing it."

Working with Sorvino, who won the Academy Award for 1995's Mighty Aphrodite, was "great", Simm says, adding with a laugh: "Oscar-winning actress, slightly nerve-racking..."

"The most nerves I had were at the read-through. I was terrified. I've never been nervous for a read-through, well, maybe when I was 22, for Heartbeat or Cracker," he says.

"It was the first time I'd ever done an American accent in front of anyone; not even my wife (actress Kate Magowan) had heard it.

"I'd just sort of done it myself, and so the first time I opened my mouth I was being recorded, sat next to Mira Sorvino. I was sweating, it was terrifying."

An acclaimed actor in his own right, Simm needn't have been

In recent years, as well as Life On Mars and the political thriller State Of Play, he's appeared on Doctor Who (as villain The Master) and juggled filming BBC One period drama The Village in the Peak District with working on Intruders in Canada.

"It was great in theory, but in reality, it was a hell of a workload. I'd be in most scenes in Intruders for five weeks, then straight back and the same with The Village, and then back again.

"There was a lot of travelling involved, a lot of jet lag..." he says.

"I was really tired, but my family came out and it was brilliant. What a great opportunity, you can't possibly moan about that."

l Intruders begins on BBC Two tonight at 9pm