Three sweet challenges will mean a bitter end for one of the six remaining bakers as they battle for a place in the quarter-final. For starters, the bakers face a sweetly filled signature challenge that has them rolling out their skills to impress Mary and Paul. And, if that wasn't enough, the technical challenge is one of the toughest of the series so far, which layers on the sweet pressure, as we test the bakers on a tricky French dessert.