No bake chocolate cake

Ingredients
Plain chocolate 300 gm grated
Butter 5 ounces
Condensed milk 1 tin
Digestive biscuit 110 gm
Method
Line a base of 1 liter loaf tin with butter paper, melt chocolate in a microwave for 1 minute add to it butter, mix till melted, add in condensed milk, pour a 3rd of chocolate mixture into the base of tin arrange the half of the broken biscuit in single layer over the chocolate, cover with another layer of chocolate, repeat with the remaining biscuits, pour over the rest of chocolate, cover with plastic wrap, place in the fridge until set about 2 hours, loosen the edges of the cake with a sharp knife, turn onto a plate to serve.