Hugh Bonneville said the final Downton Abbey film serves as a "de facto tribute" to Dame Maggie Smith, whose death in September was followed by renewed attention to the actress's enduring role in the period drama.

Bonneville, who plays Robert Crawley, Earl of Grantham, spoke about Smith's continuing influence on the franchise during an appearance on BBC Radio 2's Breakfast Show with Scott Mills alongside co-stars Michelle Dockery, Laura Carmichael, Jim Carter and Joanne Froggart. He called Downton Abbey: The Grand Finale the "fondest farewell" and said the production had already felt like a series of goodbyes since the television show ended.

"Her character passed away in the second film, but she's referred to frequently in the third," Bonneville said. "And then a few months after we finished filming, she passed away in real life. So it is de facto a tribute to her." He added, "Her presence looms like her portrait in the hall over the film, with great affection. We've got such fond and quirky memories of her over the years."

A brief shot in the film's trailer showing a painted portrait of Lady Violet Crawley prompted emotional reactions from fans when it appeared in June. Smith portrayed the family matriarch in all six television series and the two earlier films; the character died in 2022's A New Era.

Bonneville also described a moment in The Grand Finale that left him "completely floored" when he first saw it at a screening. Without giving details, he said he reached for Dockery's hand during a sequence that was not in the script and called the scene "very cathartic and moving for all of us."

The film, scheduled for release in cinemas on Sept. 12, returns many familiar faces from the Downton ensemble, including Elizabeth McGovern, Phyllis Logan, Robert James‑Collier, Allen Leech, Penelope Wilton, Lesley Nicol, Michael C. Fox and Raquel Cassidy. New additions to the cast include Paul Giamatti, Joely Richardson, Alessandro Nivola and Simon Russell Beale. Set in the early 1930s, the story sees the Crawley family and their household confronting shifting social norms, financial pressures and the fallout from Lady Mary's sudden divorce.

Carmichael, who plays Lady Edith Crawley, said the cast had "really become like a family" and reflected on the long‑running show's personal impact. She and co‑star Michael C. Fox, who plays Andrew Parker, confirmed they had married in secret; Fox first acknowledged the marriage while appearing on an NBC special, Downton Abbey Celebrates The Grand Finale. The couple have also kept private the birth of their son, who was reported in 2022 to have been born the previous year.

Cast members have repeatedly described the Downton experience as shaping both their professional and private lives. Carmichael said the show allowed actors to "have a normal life and play extraordinary lives," and that many of the cast prioritise family and home life when they are not working.

Producers and performers have framed The Grand Finale as a concluding chapter for the multi‑platform franchise. Fans and critics will judge whether it provides a final, fitting closure to a saga that began on television and expanded into two previous feature films, marked by period detail, interpersonal drama and recurring themes of social change.