Christmases gone wrong inspires Love Actually writer's new film

That Christmas premiered at the London Film Festival in October, where it received broadly positive reviews from critics.

"It can be easy to sneer at the arrival of a new Christmas movie," noted the Hollywood Reporter's Lovia Gyarkye.

"Genuine holiday cheer is tough to conjure and, if you’re not the intended audience for Hallmark-type saccharinity, the festive fare likely inspires more exasperation than joy.

"But this one slyly avoids the usual mawkishness by grounding its whimsical story in the real and prickly emotions of life."

Next Best Picture's Philip Bagnall suggested the film is "engineered to keep the kids busy around 4pm on Christmas Day while mum and dad sip their third Irish coffee in peace".

"This is unlikely to become a festive classic," cautioned Screen Daily's Wendy Ide. "But the message is a persuasive one: that Christmas comes in many shapes and forms and, ultimately, the only holiday tradition that is non-negotiable is goodwill to all."

The film sees the children of the town left to fend for themselves, providing an opportunity to design the kind of Christmas Day they dreamed of, rather than the one planned by their parents which observed various family traditions.

In one scene, the kids attempt to watch a Christmas film as their parents had suggested, but they get so bored they turn it off within moments. In a cheeky twist, the film they dismiss is Curtis's own Love Actually.

Otto says he planted this joke in the movie without Curtis knowing. When the writer finally saw it, he jokes he found it "very hurtful".

"No, not really," he laughs. "It reminded me of course that, when you say 'boring old Christmas movie', I think of Miracle on 34th Street or whatever, but when you say it to a young person, they say Love Actually. It was 20 years ago!"

One of the film's central questions is whether families should stick to traditions or be open to new experiences.

"The truth is that it shouldn't be all traditions nor a complete reinvention," Otto reflects, "because some traditions are there for a reason, and we love them. We talk about Santa to our kids for a reason, because there's something magical."

One striking thing about the film is how contemporary and diverse it feels. Curtis's earlier films were made in a different era, and he has said in recent years his approach to casting would be different today.

But That Christmas does its best to make up for lost ground. As Ide noted in her review, the film "unfolds in a fictional Suffolk seaside town... but the wide mix of accents and ethnicities suggests that the filmmakers have tried to cram the whole of Great Britain into this single tiny village".

It's not only the mixed-race family at the centre of the film which make it feel of the times. The children in the movie are concerned about climate change, and one has chronic anxiety.

There are lighter modern flourishes too - the father in one family christens his van Beyoncé, smartphones play a big part in the plot, and the soundtrack features Dua Lipa and Ed Sheeran.

Curtis acknowledges the conscious effort to make the film feel current. "I started my career on a show called Not The Nine O'Clock News," he recalls, "which was contemporary sketches, and I think always in my films I've tried to write jokes that make me laugh now, rather than traditional jokes.

"And the thing about being a parent is you spend most of your life in the real world of your kids, so I love the fact that it does feel modern, because life as it comes at you these days just is modern."

Otto picks up: "It felt true to me. If you take a snapshot of who lives [in the UK], it varies from region to region of course, but it's such a diverse, interesting, eclectic mix of people.

"It feels to me like that's the world we live in, and certainly we didn't want to create a world we lived in 10 years ago. If anything, we wanted to create a world we might live in 10 years from now, so more forward looking."

The film is being released in a healthy year for animation, with The Wild Robot, Inside Out 2 and Flow among those competing in this year's awards race.

But there is still a certain snobbery towards animated films, and only three have ever scored a best picture nomination - Beauty and the Beast, Toy Story 3 and Up.

Director Guillermo del Toro has previously championed it as its own craft, commenting: "Animation is not a genre for kids. It's a medium for art."

Curtis agrees: "I feel quite strongly about that at this moment, because for me, the two Spider-Verse movies are the most remarkable movies of the last 10 years.

"I watch them and I think, 'they must have taken 300 years to make, they're so extraordinary'. In the same way it's turned out that much pop music, which used to be looked down on, is really great, I think every genre can be great, and there are some amazing works of art in the world of animation."