GBBO: Twitter aghast at Prue Leith announcing the winner

Great British Bake Off judge Prue Leith accidentally tweeted the winner of the Channel 4 series before the show aired.

PA Video

Prue Leith, who has appeared to accidentally reveal the winner of this year's Great British Bake Off.

Prue Leith, who has appeared to accidentally reveal the winner of this year's Great British Bake Off.

The offending tweet

The offending tweet