Cake duo Jamie and Joe are tackling their most challenging commission yet: a realistic model of the island of Santorini for a couple's wedding reception. Meanwhile, baker Rosie is creating a three-foot-tall cake shaped like a sitting man. With nine layers of cake for the base alone, delivering a cake of this magnitude will be incredibly challenging. Extreme bakers Pardeep and Renu are also pulling out all the stops to bring their latest creation to life in just three days -- two full-sized swans in the shape of a heart, plus a seven-tier wedding cake.