Millie Bobby Brown and Louis Partridge on belly laughs, sibling vibes and Enola Holmes

A significant story is unfolding on the international scene. Millie Bobby Brown and Louis Partridge on belly laughs, sibling vibes and Enola HolmesImage source, Getty ImagesImage caption, Millie Bobby Brown and Louis Partridge return as Enola and Tewkesbury in Enola Holmes 3ByYasmin RufoBBC NewsPublished1 hour agoIt is rare to meet two co-stars whose chemistry is obvious before the interview has even begun but before I ask Millie Bobby Brown and Louis Partridge a single question, they are already laughing together. As they return for Enola Holmes 3, they say that off-screen friendship has helped them bring more ease and affection to Enola and Tewkesbury's developing relationship. "We realised we don't do much prep for some of the scenes - we learn our lines and rehearse and it's not that we don't take it seriously but we're really able to be in it," Partridge says.

Brown laughs as she jumps in, turning to Partridge with the kind of mock-seriousness that suggests this is a familiar routine between them. She says they bring out each other's sillier side and they spend most of their time on set "belly laughing about the most random things". "People will say to me, 'I just met Louis Partridge and I had a really interesting conversation, he's a really smart guy.

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Louis Partridge is a smart guy? " We definitely regress into our younger selves. " Partridge, 23, smiles at this and tells me there is something almost sibling-like about their dynamic, which may explain why they are so comfortable teasing each other.

"We were just remarking that we look like brother and sister," he says. "There's definitely a bit of that relationship between us. "Image source, NetflixImage caption, Enola and Tewkesbury's relationship develops in the third film with the pair getting engagedThe third film takes Enola, the teenage sister of Sherlock Holmes, to Malta, where her future with Tewkesbury is interrupted by a dangerous new case involving Sherlock's disappearance.

This chapter pushes the franchise into darker, more grown-up territory which was part of the appeal for new director Philip Barantini, best known for Adolescence and Boiling Point. "My nine-year-old daughter can't watch anything I've ever done," he says. "She's a big fan of Enola, and I wanted to make something we could watch together and challenge myself to do something different.

" His job was made easier by the fact that Brown - who has been a producer on the franchise from the start - was already thinking along similar lines about the direction of the film. "When I pitched my idea, she was already thinking about incorporating some of the darkness so it made my job easy because we were so aligned. "The film also gives Himesh Patel a proper introduction as Dr Watson, after a brief cameo at the end of the second film.

The development has drawn wide international attention, with diplomatic circles watching closely.