Preheat oven to 400°F and line a baking sheet with parchment paper.
In a medium bowl, combine flour, sugar, baking powder, and salt. Using a pastry blender or a fork, cut the cold butter into the flour mixture until butter is the size of peas. Stir in cranberries and orange zest.
In a small cup, mix 1 egg and cold cream. Add all at once to the flour mixture stirring until moistened.
Dump the dough into a well-floured surface. Knead the dough 3 or 4 times and form into a ball. Place on prepared baking sheet and press into an 8-inch circle, about 1-inch thick.
Prepare an egg wash with the remaining egg and water. Brush the scones with the egg wash and sprinkle with turbinado sugar. Cut into 8 even wedges. Do not separate.
Bake for 20 minutes or until golden brown and scones are firm to the touch. Remove from oven and allow the scones to cool down. Cut into wedges and serve warm.
Serve scones with whipped butter and orange marmalade.