Preheat oven to 400 degrees F. Line a baking sheet with parchment paper and set aside.

In a large bowl whisk together the flour, sugar, baking powder and salt.

Grate the frozen butter into the bowl and use a pastry blender or fork to combine the flour and butter until it resembles coarse meal. Stick the flour mixture in the fridge while you combine the wet ingredients.

In a small bowl combine the sour cream, heavy cream, egg, vanilla extract and orange zest. Pour it over the flour mixture and gently stir to combine, just until everything is moistened.

Fold in the cranberries. Flour or grease your hands and then gently work the dough together and pour it out onto a floured surface. Press the dough (or use a rolling pin to gently roll it) into a circle about 1 inch thick.

Cut the dough into 8 wedges. Place the scones on your baking sheet and brush the tops of them with a little bit of heavy cream. Bake for 15-18 minutes, until golden.

Remove scones from the hot baking sheet and allow them to cool for at least 10 minutes before drizzling the glaze on top.

To make the glaze, combine the powdered sugar and freshly squeezed orange juice and stir together until smooth. Add a little more orange juice or powdered sugar until you reach your desired thickness to drizzle over the scones.