Domhnall Gleeson and his About Time co-star Margot Robbie have reunited in London to begin work on their new movie, which tells the story of Winnie the Pooh author AA Milne and his family.

Gleeson plays Milne with Robbie playing his wife, Daphne. Newcomer Will Tilston has been cast as their son, Christopher Robin, the inspiration for the writer's young hero of the same name. 

The film focuses on the sometimes difficult relationship between Milne and his son, whose teddy bear collection provided the names for honey-mad bear Winnie and other characters such as Tigger, Piglet and Eyeore.

Will Tilston as Christopher Robin

It follows Christopher, his nanny Olive (played by Boardwalk Empire's Kelly Macdonald) and his parents as they are swept up in the international success of the Winnie the Pooh books in the aftermath of the First World War.

Filmmaker Simon Curtis, who directed Michelle Williams and Kenneth Branagh to Oscar nominations for the 2011 Marilyn Monroe biopic My Week with Marilyn, is behind the lens.

Domhnall Gleeson as AA Milne

The film - originally titled Goodbye Christopher Robin - is written by 24 Hour Party People screenwriter Frank Cottrell Boyce and Simon Vaughan, who recently produced the BBC's adaptation of War and Peace and who worked on the TV movie A Bear Called Winnie in 2004.

Before the cameras had even started rolling Gleeson was tipped to receive his first Oscar nomination for his role as Milne.

Domhnall Gleeson and Will Tilston on set

US magazine Vanity Fair described the upcoming film as "the kind of uplifting, nostalgia-heavy project that plucks at the heartstrings of Academy voters" and said that Gleeson's time to be on the Oscars shortlist was fast approaching after a brilliant year on screen - and at the box office. 

Two of the Dublin actor's most recent films, Ex-Machina and The Revenant, were among this year's Academy Award winners, while Brooklyn and Star Wars: The Force Awakens were both Oscar-nominated.

Domhnall Gleeson in The Revenant

The Academy's love of actors playing real-life authors is deep-rooted with Jason Robards (Dashiell Hammett), Daniel Day-Lewis (Christy Brown), Jim Broadbent (John Bayley), Nicole Kidman (Virginia Woolf) and the late Philip Seymour Hoffman (Truman Capote) among those honoured with Oscars in the past. 

Speaking to RTÉ Entertainment during the summer while promoting Suicide Squad, Australian star Robbie said she was "so excited" to work with Gleeson again.

"We worked together when, actually, it was my first proper movie and I was working with Domhnall, and now he's just done the most incredible films and he's just such a nice guy," she said.