Mix the condensed milk and vanilla extract together in a mixing bowl
In another bowl, use an electric hand mixer to whip up the double cream to soft peaks
Gently fold the cream into the condensed milk mixture using a spoon or spatula
Fold in the white chocolate chips and chopped up Jammie Dodger biscuits
Very gently swirl in the jam, don't over mix it as you want to leave swirls of jam throughout the ice cream
Put the ice cream mixture into a 2.5 litre tub, decorate the top with the extra jam, more Jammie Dodger biscuits and some freeze dried raspberries too if you have them, then put it in the freezer overnight or for at least 4 hours