Preheat the oven to 180°C (160°C fan) or Gas Mark 4.
Place the ginger nut biscuits into a food processor and blend into fine crumbs.
Add the melted butter and blend again until fully combined.
Press the mixture firmly into the base of a 20cm springform tin.
Bake the crust for 5 minutes, then remove and allow it to cool.
In a large mixing bowl, beat together the soft cheese, flour, honey, vanilla extract, eggs, egg yolk, and soured cream until smooth and creamy.
Place the tin on a baking tray and pour in the cheesecake filling.
Bake for approximately 40 minutes. The center should still have a slight wobble when gently shaken.
Turn off the oven and leave the cheesecake inside with the door slightly open for about 1 hour to cool gradually and help prevent cracking.
Remove from the oven and allow the Salted Honey Cheesecake to cool completely.
To make the topping, combine the honey, 1 tablespoon water, and lemon juice in a saucepan.
Heat gently while stirring until small bubbles appear.
Stop stirring and continue cooking, swirling the pan occasionally, until the honey becomes a deep golden caramel color.
Remove from the heat and carefully stir in the double cream.
Add the sea salt flakes and allow the topping to cool.
Spread the soured cream evenly over the cooled cheesecake.
Chill for at least 2 hours or until fully set.
Spoon the salted honey topping over the cheesecake just before serving.