What does the Piccadilly ceiling collapse mean for London theatre?
After two incidents in six years, visitors may need reassurance before they return to the West End "Don't clap too hard: it's a very old building," says Archie Rice in John Osborne's The Entertainer. His words acquire an ominous ring in the light of this week's incident at London's Piccadilly theatre and an even more horrific case six years ago at the Apollo. Osborne was suggesting that a decaying music hall was an a…