Soak the gelatine sheets in cold water for about 10 minutes. Mix the milk, vanilla, lime zest and sugar in a saucepan and heat briefly. Remove from heat and dissolve the squeezed gelatin in the hot liquid while stirring. Let cool and stir in the curd.
Put some of the 400 g blueberries aside, puree the rest and stir into the vanilla cream.
Let the cream set in the refrigerator and serve garnished with the remaining blueberries.