The half-Jamaican artist has worked with, or opened for, celebrity singers (the late Amy Winehouse), music producers (Mark Ronson) and several British comic legends. His older sister is the prize-winning White Teeth novelist Zadie Smith.

Comedy 'The Seagull' to debut in Beijing

Pure harmonies

He collaborates with Gervais on songs and comedy sketches, and once served as a script consultant for Henry, who co-founded the fund-raising event Comic Relief.

The two worlds collided this time last year when Gervais resurrected David Brent, the office boss who made him famous a decade earlier, for a political reggae song that debuted during Comic Relief. It mimics the theme tune to the children's TV show Sesame Street.

Smith also featured on the song, called Equality Street, which later became a hit. It includes immortal lyrics such as, "Black people aren't crazy. Fat people aren't lazy. And dwarves aren't babies."

The two regularly write and perform songs together.

"We've got this indie band. I'm rapping and he's singing. It's kind of a crazy thing, but hopefully we'll be over here one day doing it," Smith said.

"Gervais is like a giant kid ... and a genius. He walks into a room and his whole thing is, ...How can I make everyone in here love me and hate me?'

"He's pushing buttons, because nice comedy is boring. People like taking risks."

Smith left Shanghai on March 16 for a five-week tour of Australia, which he describes as a relief given all the attention he is now getting back home. Things have amped up since he took the role in Law & Order, which is attracting around 5 million viewers an episode.

He says he chooses to keep living in a council estate (the British equivalent of a ghetto) with his partner and two children because he likes knowing his neighbors' names, even if many of them are convicted criminals.

He is more selective about his material these days, and won't sink to gutter humor or revert to homophobic jokes just to get a response, he said. Things changed after he became a father and the public face of a campaign to get The Sun to end its long-running tradition of showing topless women, or "Page 3 Girls".

"I like boobs," he said, eager not to sound a prude. "I just think (they) are for grown-ups."

Then, perhaps uncomfortable at getting too caught up in weighty issues, he quipped: "Nursing babies should also have access to breasts."