The runways at Heathrow Airport were de-iced this morning but all flights are running as usual and there have been no delays or cancellations, a spokeswoman said.
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The author, who explored feminist themes, was best known for her Earthsea books.
Jon Lansman denied reports that the group's supporters had drawn up a deselection hit-list of 50 centrists.
The film tells the story of a deaf girl who lives in a world of silence until a social worker teaches her the gift of communication.