Bash the biscuits in a bowl until all crumbs. Melt the butter and add the lemon and orange juice, then pour into the biscuits and mix. In a cheesecake tin pour the biscuit mix and press down firmly. Add more melted butter if necessary. Place in the fridge for 30-40 mins.
In a mixing bowl, beat the cream cheese until smooth. Add the icing sugar and beat again. Add one jar of Nutella and stir in. If you're not happy that it is chocolaty enough then add more from the second jar. Mix until well combined.
Take the biscuit base out of the fridge and pour the choccy cheese mixture on top. Smooth over as best you can if you don't have a palette knife use a spoon, that's what I do. Put back in the fridge for one hour at least to chill then serve. Enjoy.