Now, a new group of children are heading to the same film studio to shoot a new version of the JK Rowling books, including 11-year-old Dominic McLaughlin as the title character.
Mrs Miles, who now lives only a short drive away in St Albans, advised any young actors joining the wizarding world to “enjoy it”.
“It’s really a once-in-a-lifetime thing working on something like Harry Potter- well, it might not be now,” she laughed.
“But it’s a really unique experience, and it’s kind of weird because when you’re in it, it just becomes normal life.
“When you come out the other side, you look back at it and you’re like ‘wow, that was so amazing,’ the things we got to do, the different experiences and all the incredibly talented people, which sort of goes over your head as a child.
“The best thing about being a child is you just take it all in for what it is, but I think really just enjoy it, make the most of every opportunity that you have there.”