Harry Potter actors Daniel Radcliffe, Rupert Grint and Tom Felton are making a Bbc documentary about their most devoted fans.

The trio is focusing on the devotees who have followed them since they burst onto the scene in the movies based on J.K. Rowling's Harry Potter book series.

Felton, who played Draco Malfoy in the films, reveals he has one very faithful supporter who has a tendency to follow him about.

He tells Britain's Mail on Sunday newspaper, "She follows me to most of the events I go to and has for a long time. I don't know if it's weird or sweet, Tina is on the more extreme end of the spectrum but she's kind and supportive, rather than menacing. But it's odd that she knows so much about my whereabouts. The other night I went out at the last minute and when I arrived at my destination, she was waiting for me."