Peach streusel cheesecake

Name: Peach streusel cheesecake
Ingredients: vegetable oil for the tin; 200g digestive biscuits; 2 tbsp caster sugar; 85g unsalted butter melted; 700g cream cheese; 250g mascarpone; 280ml soured cream; 250g golden caster sugar; 3 large eggs; 1 tbsp vanilla bean paste; 3 tbsp plain flour; 115g plain flour; 60g light brown soft sugar; 1 tsp ground cinnamon; 45g unsalted butter melted; 20g roasted hazelnuts roughly chopped; 3 ripe, firm peaches; 30g light brown soft sugar; 1 lemon juiced; 1 tsp vanilla bean paste