Blitz the digestive biscuits to a small crumb - I used a food processor, but you can bash them in a bowl with a rolling pin instead
Add the melted butter – either pulse in the food processor a few times until the mixture is combined, or mix it in a bowl.
Tip the biscuit and unsalted butter mix into the bottom of an 8"/20cm deep springform tin and press down firmly - leave to the side.
Cheesecake Filling
Melt the white chocolate in a bowl over a pan of simmering water, or in the microwave on short bursts until fully melted.
Leave to cool whilst carrying on with the rest.
Mix the full fat soft cream cheese with the icing sugar until smooth - this shouldn't take long.
Fold in your cooled melted chocolate.
Add in the double cream and continue to whip up to soft peaks, until it holds itself. Alternatively, whip the cream separately, and fold through.
Add in the chopped pistachios and pistachio spread and fold through again - I only do this slightly so it swirls ever so slightly through the mix.
Spread the mix over the digestive biscuit base, smooth over and chill in the fridge for at least 5-6 hours, or preferably overnight so it will definitely be set.
Decoration
Once set, decorate. I whip the cream with the pistachio spread and pipe around the edges, and then sprinkle on chopped pistachios and white chocolate chips
Notes
You can find my homemade pistachio spread recipe here