Is crème brûlée made with heavy cream or milk?

Crème brûlée is made with heavy cream and milk. The ingredients include 500 g Double Cream / Heavy Cream and 100 g Whole Milk. The cream, milk and the fresh vanilla are added to a saucepan and brought to a simmer. The mixture is then poured slowly over the eggs, stirring with a spatula. The recipe uses both heavy cream and whole milk to create a rich and creamy custard base. The heavy cream is also referred to as double cream in the ingredients list.