Use a food processor to blitz the biscuits into a fine crumb. Alternatively you can place them into a freezer bag and smash with a rolling pin.
Melt the butter over a medium heat, then pour it into the biscuit crumb and mix well until it resembles wet sand.
Press it into the bottom of an 18 or 20cm baking tin. Place in the fridge while you get the cheesecake filling ready.
Melt the chocolate oranges in a heatproof bowl over a pan of simmering water, then set aside to cool slightly.
Meanwhile, add the cream cheese and the golden caster sugar into a large mixing bowl and beat until well combined.
In a separate bowl, whip the double cream to soft peaks, then fold through the cocoa powder.
Now add the cream/cocoa into the cream cheese and mix well. Pour in the melted chocolate and beat until it is well combined.
Spoon it over the cheesecake base, and smooth it over with the back of a spoon.
Decorate with 8 segments of Terrys Chocolate Orange. Then pop it into the fridge to set for at least 4 hours, but ideally overnight. If you're in a rush you can speed it up by popping it in the freezer for a couple of hours.
I like to add the zest of an orange over the top, but this is completely optional. Cut it into portions and enjoy!