Saw Dust Dessert

I bumped upon this recipe in a very old issue of Good Housekeeping. It is a famous pudding in Macau where it is known as Serradura or 'saw dust'.
The recipe requires very simple ingredients which are readily available and hardly takes 20 minutes to whip up.

Ingredients:

Marie or Digestive Biscuits - 2 packets
Cream - 4 cups
Vanilla essence (you can also use strawberry, butter scotch etc as per your liking)
Condensed milk - 1 tin

Transfer the biscuits to a zip lock bag and crush them finely with a rolling pin. You can also crush them in a mixer if you like.
Spread the crushed biscuits in a glass dish. Whip the cream till it peaks. Add a few drops of the essence and condensed milk.
Suggest you add 1/2 of the condensed milk first, taste, and then add more if needed. Continue whipping the cream to stiff peaks.

Add a layer of this whipped cream on top of the crushed biscuits. Add alternate layers of whipped cream and crushed biscuits, with the top layer being that of biscuits. Refrigerate overnight and serve chilled the next day