But that doesn't stop loads of you bombarding the Newsround and the Leavesden Studio mailboxes pleading for a chance to audition for spare parts.
So they have given out the only address of a brand new casting office you can write to.
No other address!
But don't get your hopes up too much. They are not promising budding actors and actresses anything.
They just want to give you a proper address to write to if you are determined to be characters like Cho Chang or Cedric Diggory.
Remember! Leavesden Studios don't want you to phone, write or fax to any other address you might have heard about - this one only!
Send a short letter and a recent photograph to:
PO Box 322
They've asked us to ask you NOT to phone or fax. Only write.
And they can't reply to everybody, but you may stand a better chance of getting a reply if you include a self-addressed envelope.