Start by placing the digestive biscuits or graham crackers into a food processor and pulse them until they are fine crumbs. In a separate bowl, mix the crushed biscuits with melted butter until well combined. Press the mixture into the base of a 9-inch springform pan, using the back of a spoon to compact it. Chill in the fridge while you prepare the filling.
In a large mixing bowl, beat the cream cheese until smooth and creamy. Add the powdered sugar, vanilla extract, and lemon juice, and continue to mix until combined. In a separate bowl, whip the double cream until soft peaks form. Gently fold the whipped cream into the cream cheese mixture until smooth.
Once your filling is well-combined, carefully fold in the chopped Mint Aero chocolate. Be gentle to keep the airiness of the chocolate intact. Spoon the mixture onto the chilled biscuit base, spreading it out evenly. Smooth the top with a spatula.
Place the cheesecake in the fridge and let it chill for at least 4 hours, or overnight for best results. This will allow the filling to set and become firm.
Before serving, crush the remaining Mint Aero chocolate and sprinkle it on top of the cheesecake. Garnish with fresh mint leaves if desired for an added touch of freshness.