Harry Potter and the Goblet of Fire had it's London premiere in Leicester Square that night, alas it was in the rain.
David made a comment that he would never have an audience so big again- HAH!
It was also the last time we saw David on the red carpet not in a suit - even at the premiere of the next Potter film, Order of the Phoenix, which he wasn't in, he turned up in his red velvet!
Here's the interview: