| http://www.w3.org/ns/prov#value | - The open letter is signed by dozens of actors, comedians, politicians, writers and other prominent individuals, including music legend Roger Waters (ex-Pink Floyd) and Clive Stafford Smith, the director of the legal action charity Reprieve, who both attended the launch on November 24, the comedian Frankie Boyle, the journalist Jemima Khan, actress Juliet Stevenson, actor Mark Rylance, singer Sophi
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