Grease and line a 20cm springform tin with baking parchment.
Mix the crushed digestive biscuits with the melted butter until evenly coated.
Press the mixture firmly into the base of the tin and chill for 20 minutes.
Beat the softened cream cheese with the icing sugar until smooth.
Whisk the chilled double cream to soft peaks, then fold in the Greek yoghurt.
Add the lemon zest, lemon juice, and vanilla extract, mixing until fully combined.
Gently fold the cream mixture into the cream cheese mixture until smooth and airy.
Spoon the filling over the chilled biscuit base and smooth the top with a spatula.
Cover with cling film and refrigerate for at least 6 hours, preferably overnight.
Remove from the tin, decorate with your favourite toppings, slice, and serve chilled.