A considerable majority of voiceovers for tv documentaries are done by people you've become aware of, but just about never are they there to accentuate themselves. "I would believe it will be a rather specialist viewership that said, 'I will see that program since John Shrapnel's voice is on it,'" points out John Shrapnel, that has done a great deal of work on natural history movies. That specialised viewership would probably have his immediate household and his agent.
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