Preheat oven to 180 degrees C. Sift together the flour and bicarb soda.
In a separate bowl, cream together the butter, sugar, vanilla sugar and golden syrup; mix well. Stir in the flour and mix until just incorporated. Form dough into two 3cm thick elongated rolls the length of your biscuit pan. Place the rolls on the biscuit pan with enough space in between for them to spread.
Bake in preheated oven until they are light golden brown and have flattened; about 20 to 22 minutes if using margarine, or 13 to 15 minutes if using butter. Remove from oven and let cool slightly for about 3 minutes. Cut diagonally into 4cm strips while still warm. Remove individual biscuits to cool on a wire rack.