The fourth series of 'The Great British Bake Off' is shaping up to be the most memorable yet. At the time of writing we're not even halfway and there's already been salted angel food cake, matte macarons, stolen custard, gingerbread squirrels with hazelnut nuts and absolutely loads of blue plaster disasters. But have you got your head around who's left of the baker's dozen yet? Can you even remember which one's Mel and which one's Sue? With our set of Bake Off crib sheets you'll have star baker knowledge in no time.