I've actually used the Emmerdale Plane crash as a prelim to a mass exercise once.... complete with Cockpit and pig entrails...
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Im the Health & Safety Governor for a local school & i too used the plane falling out the sky scenario for a fire drill once. I blocked all the usual primary exits, making everyone think about a secondary exit- even some of the teachers got confused!
I remember always moaning about fire drill as a child, how my eyes where opened to "acting" out a disaster scenario as above with the school. Major changes where swiftly brought in!