Add the cold water over the gelatine and let it sit.
In a bowl combine the double cream and the condensed milk. Melt the gelatine in the microwave for a few seconds and add it in the bowl, stir until combined.
Chop a banana
In a pan add half of the white and chocolate biscuits and break them. Add the slices of banana and top them with the remaining biscuits.
Pour the liquid and leave it in the fridge for 1-2 hours.
Melt the chocolate and add the milk. Stir until combined
Decorate with some crushed nuts. and the chocolate