Harry Potter's magical miscellany: Daniel Radcliffe's lacy bra, Robbie Coltrane's body double and Spielberg's biggest mistake ...

By DAVID THOMAS Seven secretsThe penultimate Harry Potter movie — The Deathly Hallows, Part 1 — opens today and, with one million tickets pre-sold in the UK, it is expected to be the year's biggest box office hit. To mark the occasion, super fan David Thomas opens his own chamber of secrets to bring you his spellbinding trivia, with everything you ever wanted to know about the world’s most famous