The X-factor

He's a national treasure: an acting colossus whose extraordinary repertoire has taken in everything from Alfred the Great to Zebedee. And with the Da Vinci Code and X-Men 3 due for release next month, Sir Ian McKellen is showing no sign of putting up his feet. Here, he talks to Simon Garfield about American homophobics and English eccentrics, and why doing Corrie proves 'he can't be a star'. [More]