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What's OnGBBO: Twitter aghast at Prue Leith announcing the winnerBy The NewsroomPublished 31st Oct 2017, 15:02 BSTUpdated 12th Dec 2017, 13:12 BST Prue Leith, who has appeared to accidentally reveal the winner of this year's Great British Bake Off.Great British Bake Off judge Prue Leith accidentally tweeted the winner of the Channel 4 series before the show aired.PA VideoRelated topics:Prue LeithTwitterChannel 4