In a small bowl, soak the gelatine leaves in cold water.
In a small saucepan over a medium heat, warm the whey until steaming. Squeeze the sheets of gelatine and add to the whey, stirring until they have completely dissolved. Leave to cool slightly.
Add a splash of the whey mixture to the melted chocolate, mix thoroughly, then continue to gradually combine the two. The mixture should be very glossy.
Whisk the cream to medium peaks. Add a spoonful of the cream to the chocolate mixture and stir well. Fold in the rest of the cream, working quickly. Spoon into dessert glasses and chill for 3 hrs. Serve each one with a large pinch of sea salt and some chocolate shavings sprinkled over.