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Executive producer Bryan Elsley announced last month that the show's entire cast will change for the next season.
Teenagers aged 16 and 17 showed up at Parliament Hill School in North-West London today as casting scouts searched for the next stars of the hit E4 drama.
Tony's younger sister Effy (Kaya Scodelario) will be the only existing cast member to appear in the third series next year.
She said: "I'm very excited to work with some new people and see how the show changes. But I think it's good to have a fresh start. Because people do move on, people do leave. So, it's great that they're doing it. It's different as well. It's very exciting."
Producers are looking for identical twin girls, an Eastern European and a "nasty piece of work" for the new cast.
The second day of open auditions will be held tomorrow at the same location.
The season two finale airs tonight at 11pm on Channel 4.
