Dry roast peanuts and walnuts separately.
Set aside to cool. Once cool, blitz the peanuts and malted biscuits in a food processor to fine powder. Transfer in a bowl.

In a pan add 1/2 cup sugar and 1/2 cup water. Bring it to boil and turn off the heat. Add 50 grams of butter to it. Once incorporated add the white chocolate and stir until all in corporates. Pour in the biscuit and peanut powder and mix well. Keep mixing until it starts forming a dough consistency. Divide in 2 parts and transfer in ziplock bag and spread to a thin layer.
Refrigerate for one hour or until set.

Repeat the above step for the walnuts and digestive biscuits for the 2nd layer.
Remove from fridge and cut the bag for all 4 parts and put one layer of each on top of each other on a greaseproof paper. Cover and put weight on top and refrigerate for minimum if 4 hours.
Melt the milk chocolate and add oil to it. Mix until all incorporated.

Remove the fudge from refrigerator and pour the chocolate on top. Refrigerate until set. Remove from fridge and cut it desired shapes. Enjoy !