Melt the butter and white chocolate gently in pan over a saucepan of simmering water.
Stir until smooth and allow to cool for 10 minutes.
Add the crushed biscuits, marshmallows and sweets and press into a small roasting pan, lined with baking paper.
Melt the remaining white chocolate, drizzle over the top and add decorations.
Chill for about 2 hours. Remove from the fridge and cut into chunks.
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