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[1982] 1 WLR 349 (CA). A negligent motorist caused an accident in a tunnel, which led to the officer on the scene negligently directing a police constable to cycle against the traffic to close off the entrance. When the constable was injured, was the original negligent motorist liable? The trial judge said 'yes', the Court of Appeal said 'no'. See CausationInNegligence for discussion.