It’s the grand final for the contestants and after seven tough weeks the three finalists face their biggest challenge yet – baking for The Great British Bake Off’s street party.They will be baking for judges Mary Berry and Paul Hollywood, but also friends, family and former Bake Off contestants. Our finalists will reach new height of baking. They will be making a selection of petits fours and puff pastry, a first for The Great British Bake Off.They also be baking mille-feuille, mini Victoria sponges, strawberry and cream meringue nests and miniature strawberry and rhubarb cheesecakes.Who will be crowned as Britain’s best amateur baker on Great British Bake Off 2011? If sonly it could be all of of them…