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This candlelit event in the historic church adjoining Westminster Abbey is run by the homelessness charity Passage, which operates the UK's busiest day centre. The silver-voiced St Margaret's choir will lead the carol singing, interspersed with readings from celebrities including Dame Penelope Keith (The Good Life), Huw Edwards (BBC News), James Fleet (Four Weddings and Funeral) and Julia McKenzie (Agatha Christie's Marple).