Make Custard: Boil milk with, little sugar, condensed milk and custard powder, stir it till it boils remove from flame and cover it. Beat whip cream till peaks are formed fold in condensed milk, essence and gelatine mix well. Keep the bowl in freezer. Lay (whole) digestive biscuits in a medium sized casserole. Make another layer of digestive biscuits, the entire base should be covered with biscuits Then sprinkle warm milk on it. Pour vanilla custard on biscuits and level it, sprinkle crumbled flake chocolate over custard. Then put another layer of digestive biscuits, just one layer covering entire custard layer. Sprinkle warm milk carefully on biscuits. Remove cream from freezer and pour cream mixture on biscuits, level it. Sprinkle cocoa powder on entire pudding. Put cling film and let it set in fridge for 4-5 hrs or overnight.
