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the virus and potential down the line, even less vaccine efficacy against mutated versions of the virus. we know this because of the last six months. >> reporter: the government hopes most people will follow the new message. yes, it is going away but please dome change your behavior. uchbl with its own advisers says that's messy and inconsistent. >> this kind of mixed messaging is really damaging. we've had it previously in the pandemic. and people want clear guidance. they want leadership. and they want clear, concise and coherent messages. >> reporter: this is an unprecedented experiment. a desperate bid for freedom. its success or fail you're will be measured in lives and suffering. the government's own scientific advisers saying they don't know how this will turn out. it will ultimately come down to the people and how cautiously