Preheat oven to 425 degrees. Place baking sheet in oven to preheat as well.
Warm milk in the microwave for 30 seconds. Add vanilla and lemon juice to milk. Set aside. In a separate bowl, mix all dry ingredients with a whisk. Add butter to dry mixture and use your hands to quickly incorporate the butter until the mixture beings to crumble. Make a well in the center of the dry and add the wet, mixing just until combined.
Gather dough together and on a floured surface fold the dough over itself 4 times, leaving it at 2 inches in height. Cut into scones using a sharp knife or round cutter. Brush beaten egg on and sprinkle sugar on top.
Carefully place scones on hot baking sheet and bake for 10 minutes. Eat or freeze immediately. Serve with jam and homemade clotted cream!!!