Plath's daughter, Frieda Hughes, will introduce the performance at the Royal Festival Hall in London on Sunday 26 May.

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Frieda Hughes has written about her parents and her own battles with depression but a family friend dismissed the idea that Nicolas's death fitted into a family trend.

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Hughes' widow Carol, who he married in 1970, and his daughter Frieda will be among those attending the ceremony, when the Kirkstone green slate memorial stone will be laid.

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