Melt together the milk chocolate and 3/4 can of condensed milk in a bowl over a simmering pan on the hob

At the same time melt the white chocolate and the rest of the condensed milk in the same way, stirring both occasionally. Once melted leave both to cool

In a large bowl mash the biscuits up with a rolling pin (or use a processer if you have one) until it resembles breadcrumbs

Melt the margarine in the microwave for 40 seconds and mix into the biscuits until sticky

Spread the mixture evenly into the bottom of a large flan dish and leave in the fridge to set whilst you prepare the cheesecake

Place the 200g of mascarpone in a large bowl with the 400ml cream and 3 tbsp sugar and whisk with an electric mixer until thick

Fold in the milk chocolate mixture well and pour over the biscuit base. Leave in the fridge to set for 3-4 hours

Once the middle layer has set, mix together the white chocolate mix with the remaining mascarpone cheese, cream and sugar until thick.

Pour onto the top of the cheesecake and carefully spread it out evenly

Leave to set for a further 3-4 hours or overnight

Once set serve and enjoy