Preheat the oven to 180℃ (160 °fan/ 350 ℉/ Gas 4).
Place all of the toffee sauce ingredients in a heavy-based saucepan. Bring to a boil, and cook for 3 minutes.
125 g Golden Syrup, 125 g Light Brown Sugar, 50 g Butter, 100 ml Single Cream, 1 teaspoon Vanilla Extract
Whisk continuously to prevent the sauce from burning. After 3 minutes, take the saucepan off the heat and set aside.
Put the dry crumble ingredients in a large mixing bowl. Pour over the melted butter. Mix with a spoon until crumbles form.
125 g Plain Flour, 125 g Oats, 125 g Demerara Sugar, 125 g Butter
Peel, core and slice the Bramley apples and place them in a 1.5 litre pie dish. Sprinkle over the cinnamon and pour over half the toffee sauce (reserve the other half for serving).
6 Bramley Apples, 1 teaspoon Cinnamon
Spoon the crumble topping onto the apples and bake in the oven for 40-45 minutes until golden brown. Serve with the reserved toffee sauce.