It's the Tube, actually...

Darcy (Colin Firth) is back on the Tube later this year in a new comedy starring Hugh Grant, his love rival in the film Bridget Jones's Diary.

Colin spent a morning perfecting a shot where he rides down an escalator at Canary Wharf station.

The film, Love Actually, marks writer Richard Curtis's directorial debut.

He is the first British screenwriter whose films have earned more than $1billion worldwide

It tells ten separate but intertwining stories of love in London, leading up to a big Christmas Eve climax.

One of the threads follows the new Prime Minister (Grant), who on his first day in Downing Street falls in love with the tea girl, EastEnders' Tiffany Mitchell, Martine McCutcheon.

It has an all-star British cast, including Rowan Atkinson, Liam Neeson, Bill Nighy, Alan Rickman and Emma Thompson.

Curtis, who wrote Notting Hill, Four Weddings And A Funeral and the screenplays for Bridget Jones's Diary and Bean, used the Tube for a number of key sequences.

Firth, 44, star of Pride And Prejudice, Another Country, The English Patient, Shakespeare In

Love and Fever Pitch, plays a jilted writer. He moves to the south of France and falls in love with his Portuguese housekeeper.

During filming he cracked jokes with LU's filming boss Kate Blow.

She said: 'He loved watching the people come and go through the station. It really fascinated him.'