EMMA Watson’s body double in Harry Potter has revealed the actress had an allergy that forced her to be replaced on set.

Flick Miles – who hosts the podcast Behind The Wand: Stories from the Harry Potter films – stepped in as Hermione Granger during the second film, Chamber of Secrets.

Flick Miles was Emma Watson’s body double in Harry PotterCredit: BBC

Actress Emma with FlickCredit: BBC

Emma’s double acted as the cat on-screenCredit: BBC

Flick was almost identical to EmmaCredit: BBC

Talking about secrets behind the scenes of the series, which is based on seven fantasy novels written by author J. K. Rowling, Flick said she played Hermione when she transformed into a cat.

The character had accidentally added the cat’s hair to her Polyjuice Potion, which she believed to belong to Millicent Bulstrode.

Body double Flick told BBC Three Counties: “Basically when you’re under 16 you can only film for four hours a day on set.

“So just to make filming as quick as possible they would use Emma for four hours and then me for four hours for things that were far away or over the shoulder.

“The biggest scene that I was part of was when Hermione turns into a cat in Chamber of Secrets.

“Emma had a slight reaction to the glue they use to stick the make-up on so they asked me to do that part.

“So when you see Hermione as a cat in Chamber of Secrets is actually me.”

Flick launched her podcast 20 years on from the release of the first film to mark the anniversary.

She said at the time: “I got back in touch with some of the most influential people involved in creating the film.

“They have shared their untold stories and amazing memories of what it was like to bring Harry Potter to life.”

Emma, who is now 33, was cast as Hermione when she was 11 years old alongside Daniel Radcliffe and Rupert Grint who played Harry and Ron.

Emma presenting the Oustanding British film BaftaCredit: Rex