If you close your eyes and think of 2005, you might smell popcorn and hear the sound of a heavy wooden cane thumping against a floorboard. That was the year Nanny McPhee hit theaters, bringing with it a snaggle-toothed Emma Thompson and a gaggle of the most delightfully "unmanageable" children in cinema history.
At the head of that unruly pack was Simon Brown.
You know the face. Wide eyes, a skeptical smirk, and a level of poise that felt way too mature for a kid in a Victorian nightshirt. That was Thomas Brodie-Sangster, an actor who has since become a sort of urban legend for his inability to age. But looking back at his time in the Brown household, there is a lot more to the story than just a "talented kid" in a hit movie.
The Age Gap Nobody Noticed
Let's talk about the elephant in the room. Or rather, the teenager in the nursery.
One of the biggest misconceptions about Thomas Brodie-Sangster in Nanny McPhee is how old he actually was during filming. Because he has that famously youthful face, most people assume he was maybe ten or eleven, just like his character Simon.
He wasn't.
Thomas was actually 14 when he filmed the movie and 15 by the time it was released in 2005. To put that in perspective, he was basically a high schooler playing a pre-teen. It’s wild. He was only five years younger than Keira Knightley, but while she was playing a grown woman in Pride & Prejudice, he was still leading the "rebellion" against a magical nanny.
This age gap actually worked in the film’s favor. Simon is the eldest of the seven Brown children. He isn't just "naughty"; he’s grieving. His mother is dead, his father (played by a very stressed-out Colin Firth) is emotionally distant and drowning in debt, and Simon has stepped up as the de facto leader of the siblings.
He needed that teenage gravity. Thomas brought a specific kind of "older brother" authority that a younger kid might have struggled to fake. When Simon tells Nanny McPhee that they’ve driven away seventeen previous nannies, you actually believe him.
Why Simon Brown Was the Hardest Role
Acting with Emma Thompson is probably intimidating for anyone, let alone a kid. But Thomas had to do something very specific: he had to be the antagonist who wasn't a villain.
Nanny McPhee uses five lessons to change the family. Simon is the one who resists the most. He’s the brains behind the "cooking the baby" prank—which, let’s be honest, is still one of the most traumatizingly funny opening scenes in a family movie.
But if you watch his performance closely, Simon isn't mean. He’s scared.
The complexity Thomas brought to the role is what makes the movie's climax work. By the time they get to the "Lesson 5" moment—learning to take responsibility—Simon has to transform from a cynical rebel into a protector.
Behind the Scenes of the Chaos
You’d think a set with seven kids, a donkey, and a pig would be a nightmare. Honestly, it sounds like it was kind of a blast.
- The Food Fight: The massive cake-throwing scene at the end? That wasn't just CGI or clever editing. The cast actually spent days pelted with "food" that was largely made of dyed mashed potatoes and shaving foam.
- The Pig: There’s a scene where the kids dress up a pig in their clothes to trick their Great Aunt Adelaide. Thomas later joked in interviews that the pig was one of the better-behaved co-stars.
- The "Nanny" Magic: Emma Thompson spent hours in the makeup chair to get those warts and that unibrow. Thomas has mentioned in various "then and now" reflections that seeing her transform daily helped the kids stay in character—it was genuinely hard to see "Emma" through the "McPhee."
From Nanny McPhee to the Iron Throne
It’s easy to look back and see Thomas Brodie-Sangster as just "the kid from the nanny movie," but this role was the bridge to everything else.
Most people remember him from Love Actually, which came out two years prior. But in that film, he was the cute kid learning the drums. In Nanny McPhee, he proved he could carry the emotional weight of a feature film.
Think about his career trajectory after 2005:
- He voiced Ferb in Phineas and Ferb (yes, that was him).
- He became the prophetic Jojen Reed in Game of Thrones.
- He led the Gladers as Newt in The Maze Runner.
- He played the world-class chess champion Benny Watts in The Queen’s Gambit.
Every single one of those roles requires a "stillness." Even as a 14-year-old in Nanny McPhee, Thomas had this ability to look like he was thinking ten steps ahead of everyone else in the room. That "Simon Brown" energy never really left him.
What Happened to the Rest of the Kids?
It’s sort of a trope that child stars disappear, but the Nanny McPhee crew stayed pretty busy. Eliza Bennett (Tora) is still acting and has a successful music career. Raphaël Coleman (Eric) sadly passed away in 2020, but he had become a dedicated climate activist.
Thomas, however, remains the "face" of that generation of British child actors. Maybe it’s because he looks exactly the same. Even now, married to Talulah Riley (who he met on the set of Pistol), he still carries that same spark he had when he was trying to trick Colin Firth into thinking he’d eaten his own siblings.
The Lasting Legacy of the "Brown Leader"
So, why does Thomas Brodie-Sangster in Nanny McPhee still trend on social media twenty years later?
It’s partly nostalgia, sure. But it’s also because the movie is one of the few "kids' films" that treats children like people. Simon Brown wasn't a caricature. He was a kid trying to keep his family together in the only way he knew how—by being a nuisance so his father would have to pay attention to them.
Thomas played that desperation perfectly. He didn't play it for laughs; he played it for real.
Next Steps for the Super-Fan
If you're feeling the itch to revisit the world of 2005, you should definitely check out the 20th Anniversary behind-the-scenes footage often found on streaming extras. It shows the "making of" the food fight, which is worth it just to see Colin Firth covered in blue icing. Also, if you haven't seen it, Thomas's work in The Artful Dodger (2023-2024) is a great spiritual successor to his Victorian roots in Nanny McPhee—just with more surgery and less magic.