The Great British Bake Off fans have declared last night’s episode one of the “best ever” thanks to a bizarre showstopper challenge.The hugely popular baking competition returned on Tuesday (22 September), with the bakers challenged to create three-dimensional busts of their celebrity heroes.Among the stars being celebrated in cake form were David Attenborough, Lupita Nyong’o and Bill Bryson.However, while the illustrations promised recognisable likenesses of the celebrities they were imitating,