Melt chocolate, butter and golden syrup in a bowl above a pan of boiling water. When melted and thoroughly combined add the vanilla.
Add the chopped biscuits to the chocolate. Stir to combine then add the marshmallows and stir in too.
Line a tin with baking paper and add the chocolate mixture. Dividing the tin into quarters, decorate one with macadamia nuts only, one with raisins only, one with nuts and raisins and one quarter without anything on the top. Alternatively, stir all the ingredients together at stage 2.
Leave to cool. When cool put in the refrigerator to finish setting.
Cut into bite sized squares and serve.
Nutritional information is approximate and a guideline only.