My father Sam Kydd was in this, playing Charlie's assistant in an illusionist cabaret act that involved explosions. After the run through, and before the live transmission Charlie decided the explosions needed to be 'beefed up' as he felt they weren't big or loud enough. The consequence was that he and my dad, when the explosions went off, were actually knocked unconscious by the explosions and both taken to hospital and the show had to be abandoned.