Heat the oven to 180°C/fan 160°C/gas 4. Line the base of a 23cm springform tin with baking parchment.Whizz breifly again, then tip the mixture into the tin and press down firmly. Bake for 10 mins, then cool.

Reduce oven temprature to 140°C/fan 120°C/gas 1. Wrap a double layer of foil, lined with cling film, around he base and sides of the tin to make it watertight. Break 400g chocolate into a pan, then pour in the cream and heat until the chocolate has melted. Leave to cool slightly. Rinse the bowl of the processor, then blend the cream cheese, eggs and vanilla essence together with the melted chocolate and cream until smooth.

Put the tin in a deep roasting tray, then pour in the filling. Half fill the roasting tray with boiling water, bake for 1 hr, then turn the oven off. Leave to cool in the oven with the door slightly ajar for 1-2 hrs. Lift the cheesecake from the water, discard the foil, then coer with cling film and chill. The cheesecake can be made up to 3 days ahead. Great th remaining chocolat over the cheese cake before serving.