...basically, it was a motorcycle stunt for a live(!) British Saturday morning kid's show that went horribly wrong.
The timing of the motorcycle, announcer and explosives all went horribly wrong. If you see at the beginning of the clip, she's basically sitting right next to the explosive charge to her right which sets her microphone, arm and hair on fire.
The announcer lived, but suffered 2nd degree burns and hearing loss.
Crazy.