Denise Hickman, a Mencap caseworker at the charity's Smile! Stop Hate Crime project in Nottingham, has told ITV News that the Paralympics were great as "it brought into the public consciousness that there are people with disabilities who do fantastic things".
But she added: "On the ground, we haven't heard that it's made any difference".
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The letter said he could "wipe out 470 disabled individuals" to help "revitalise the world economy" and "prevent World War III".