Put butter, syrup, drinking chocolate, caster sugar into a pan and melt over a low heat. Break the biscuits in a plastic bag using a rolling pin. Add sultanas and broken biscuits to the melted ingredients. Press the mixture into a non-stick baking tray or swiss roll tin Melt the chocolate in microwave for 1 minute, (or in a basin over simmering water). Pour melted chocolate over other ingredients and allow to set in the fridge once cool. Cut into slices.
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