Great British Bake Off viewers witnessed chaotic scenes during Tuesday night’s episode as host Alison Hammond took a dramatic tumble from a worktop in the tent. The incident occurred during the technical challenge of ’70s week, as contestants were focused on creating their banoffee pies. The 49-year-old presenter attempted to lift spirits by declaring: “I’m just going to add a little bit of happiness in here,” before hopping onto an empty worktop. However, her spontaneous attempt at entertainment quickly went awry when she lost her balance while trying to perform a leg lift, resulting in a spe…