Mash the raspberries in a bowl using a fork, then strain through a sieve into a clean bowl to remove seeds.
Stir in icing sugar until fully dissolved and set aside.
In a large bowl, whisk the double cream with vanilla extract until soft peaks form.
Gently fold in the condensed milk, chopped white chocolate, and half of the raspberry sauce.
Line a shallow tray with baking paper and pour in the mixture.
Spoon over the remaining raspberry sauce and lightly swirl to create a ripple effect.
Freeze for at least 4 hours until firm.
Remove from freezer for 5 minutes before serving. Cut into discs and sandwich between biscuits to assemble Raspberry White Chocolate Ice Cream Sandwiches.