HOLLYWOOD actress Thandie Newton says she could not turn down a role in Line Of Duty because it is "the best thing on British TV".

The Crash star, regularly seen in films and big-budget US TV series such as Westworld, explained why she was so keen to take on the fourth season of the BBC police drama which returns on BB1 tonight at 9pm.

She said: "It's because it's the best thing on British TV. When I saw the third season, I was transfixed.

"I couldn't believe how daring they were to get rid of the star in the first f***ing episode."

The hit BBC1 programme, known for its shocking twists, focuses on a police anti-corruption unit and also stars Vicky McClure.

Newton said: "I watched all the episodes, met [creator] Jed [Mercurio] the next day and before even reading the script, I was in.

"I was like, 'Oh my God, the golden age of television is back'."

Newton admitted she would love to do more British TV, but said there were not enough roles available.

She said: "Oh God yeah, but it's all costume drama, dahling. That's the fly in my ointment. You're not going to put a person with brown skin in any of those.

Adding: "If I could be in Downton Abbey or Victoria, what would I be? A maid? No thanks."