Use a food processor to whizz up the digestive biscuits into crumbs. Or put them in a food bag and smash with a rolling pin. Then put into a mixing bowl
Add the melted butter to the biscuit crumbs and mix together, then press them into the bottom of a 23cm springform tin until compact and an even layer. Put it in the fridge for 30 minutes
To make the filling use an electric hand mixer or a food mixer with a whisk attachment to mix together the full fat cream cheese, icing sugar, cocoa powder and orange extract until smooth
Add the double cream and whisk again until the mixture thickens considerably. You want it to be thick enough so you have to shake or tap the spoon to make it fall off. Fold in the chopped up segments of the Terry's Chocolate Orange with a spoon or spatula
Put the filling on top of the biscuit base and smooth it over. Put it in the fridge overnight or for at least 4 hours to set
Remove from the tin and put on your serving plate. Smooth the sides with a butter knife to create a neater finish
Melt the 55g of Terry's Chocolate Orange in a glass bowl in the microwave. Start with a 30 second blast, stir the mixture, then do 10 second blasts stirring in between until it's melted. Pour the melted chocolate into a piping bag, snip off a small bit at the end and pipe it all over the top of the cheesecake, or drizzle on with a spoon
Whip up the double cream with the icing sugar and vanilla using an electric hand mixer or by hand with a whisk and pipe it all around the edge of the cheesecake using a piping bag fitted with a nozzle or your choice, or dollop it on with a spoon
Decorate with the remaining Terry's Chocolate Orange segments
Serve immediately, store any leftovers in the fridge and eat within 2 days