Grease and base line an 8" loose bottom tin with baking paper
Mix together butter and crushed biscuits. Tip into the tin and flatten on the base and about 1 1/2 inches up the side using the back of a spoon. Place in the fridge to chill while you prepare the filling.
Whisk together the cream cheese and sugar until the sugar is completely dissolved.
Add double cream, vanilla essence and a pinch of salt, and whisk until the mixture stands in soft peaks.
Remove 4 biscuits from the unused pack and carefully cut in half so the biscuits stay in tact, you should have 8 halves. Leave these aside for decorating. Chop the remaining cookies into quarters and fold through the mixture.
Pour the filling into the base. Use a spoon to level the top and decorate with the left over cookie halves.
Leave in the fridge until ready to serve. carefully remove from the tin and place on a serving plate.