In a food processor, add biscuits and process until fine.
Add melted butter through funnel of processor whilst running.
Press into the bottom of a lightly greased and lined spring form cake tin.
Bake at 180C for approximately 10 minutes. Set aside.
Melt dark chocolate in a glass measuring cup or bowl in the microwave for about 40 seconds.
Add the milk chocolate and microwave a further minute, stir and return for another 10-20 seconds if it isn't fully melted, until smooth. Do not overheat. Cool slightly.
Place cream cheese and condensed milk in a large mixer bowl and beat until combined.
Increase mixer speed to high and whilst blending, add thickened cream and alcohol (or coffee). Slowly add melted chocolate whilst mixing and incorporate well. Beat until mixture is smooth and lightened in colour.
Pour into base and refrigerate for at least 4-6 hours before serving.