Line a square silicone pan with baking paper.
In a pan, melt together the chocolate, butter and golden syrup until smooth.
225 g dark chocolate, 75 g unsalted butter, 3 tbsp golden syrup
Take off the heat. Pour the Digestive nibbles into the pan and stir through.
120 g white chocolate Digestive nibbles, 120 g orange Digestive nibbles, 85 g milk chocolate Digestive nibbles
Add the marshmallows and give a quick stir.
65 g mini marshmallows
Pour the chocolate mixture into the lined pan and spread it around evenly, smoothing the top.
Pop the tray into the fridge and chill until set. This should take around two hours or you can also leave it overnight.
Cut into slices and serve!