Crush the digestive biscuits into fine crumbs and mix with the melted butter until the mixture resembles wet sand. Press firmly into the base of a 20–23cm springform tin and chill for 30 minutes.
Beat the cream cheese and icing sugar until completely smooth. Add the vanilla extract, lemon zest, and fresh lemon juice.
Whip the cold double cream until soft peaks form, then gently fold it into the cream cheese mixture until light and fluffy.
Spread the filling evenly over the chilled biscuit base and smooth the surface using a spatula.
Warm the lemon curd slightly until spreadable, then spoon or swirl it over the cheesecake.
Cover with cling film and refrigerate for at least 6 hours, preferably overnight.
Carefully remove the cheesecake from the tin, decorate with fresh berries, lemon zest curls, lemon slices, and a light dusting of icing sugar before serving.