Put some plastic kitchen wrap along the bottom and sides of a cake tin with plastic coming out over the sides.(So you will easily be able to lift cake out of tin when prepared).
Mix base ingredients in a bowl, then press biscuit mix into the bottom of cake tin.
Beat all filling ingredients except cream together until smooth, then fold in cream.
Put filling into cake tin on top of base. Freeze for a few hours. When cake is hard pull out of cake tin. leave at room temperature for a few minutes then eat.
Optional lemon topping.
Heat and mix together a jar of lemon jam with some sugar and lemon juice in a saucepan. Put as much of each ingredient until you like the taste.When sugar has dissolved take off heat,let cool for a while. When cool spread topping on top of frozen/semi frozen cheesecake with a spoon and wet knife. Freeze cheesecake again for topping to harden.