Whisk sugar and cornflour in bowl. Set aside.
Whisk sugar, flour and baking powder in a separate bowl.
Add butter, egg, milk and golden syrup. Whisk until mostly lump free.
Scrape into baking dish (6 cup/1.6L/1.6Q greased with butter), smooth surface.
Sprinkle Butterscotch Sauce sugar mixture all over surface.
Pour boiling water over the surface over the back of a dessert spoon held as close to the batter as you can (to soften the pour so it doesn’t break the surface of the batter).
Bake 40 min at 180°C/350°F (160°C fan) or until skewer inserted into the cake part comes out clean.
Cut through pudding to reveal butterscotch sauce underneath.
Drizzle with sauce and serve with ice cream
