You will need a 2 lb loaf tin lined with cling film
Method
Mix the digestives and melted butter and place in the bottom of the lined loaf tin. Put in the fridge for the butter to harden.
Put the couverture in a pyrex bowl over a pan of barely simmering water, without letting the bowl touch the water, until melted.
In a large mixing bowl beat together the cream cheese, cream and sugar. Add the melted couverture and beat until smooth.
Spread over the biscuit base and leave to set in the fridge.
Turn out and serve as is or with fruit.
