Hundreds of screaming Potter fans queued outside the studios in Leavesden, near Watford in Herts, where all the multimillion pound-grossing films based on JK Rowling's magical stories were shot.
Local boy Grint, who played Ron Weasley, said: "This is the most glamorous I've ever seen Watford."
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We'll have to wait until the weekend but by then it will be warming up.