The ultimate makeover: New York cheesecake

Name: The ultimate makeover: New York cheesecake
Ingredients: 35g butter; 85g reduced-fat digestive biscuit, finely crushed; 2 x 300g/11oz tubs light soft cheese, we used Philadelphia cheese, at room temperature; 175g golden caster sugar; 3 tbsp cornflour; 1½ tsp finely grated lemon zest, preferably using a Microplane grater; 1 tsp lemon juice; 1 tsp vanilla extract; 3 egg, room temperature, beaten; 150g fromage frais; 25g golden caster sugar; 225g punnet blueberry; ½ tsp finely grated lime zest; 100g fromage frais