Patisserie Week - Semi-Final

It's the semi-final of the Great British Bake Off, and the remaining bakers are desperate to claim their place in the final. They know they are just three patisserie challenges away from the biggest day in their baking lives. First comes the Signature, and there's a deceptively simple challenge with Paul and Prue looking for perfection. The heat is on with Prue's complex, multi-layered Technical. And the semi-finalists feel the pressure when they're asked to create a spectacular Showstopper that could grace a Parisian patisserie. Who has the skill to reach the Bake Off final? And who will fall at the final hurdle?