Pour the heavy cream into a bowl and whip until you've made a thick whipped cream. Stir in the condensed milk.
Stir in the Graham Cracker/Digestive crumbs, chocolate chips and micro marshmallows.
Evenly divide the mixture between four ice cream molds. You'll probably have a little extra which you'll need to store in a small container.
Pop the ice cream molds and container into the freezer and leave for at least 8 hours to set.
Before serving, remove the plastic from the ice cream molds and roll the ice cream in some extra chocolate chips and micro marshmallows before serving.