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Preheat oven to 375º F. Line a baking sheet with parchment paper.
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In a large mixing bowl, combine the flours, oats, sugars, baking powder and salt.
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With a fork or your fingers, cut the butter into the dry ingredients. Stir in raisins.
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Whisk together the egg, milk and vanilla.
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Make a well in the center of the dry ingredients and add the liquid all at once to the bowl. Lightly, mix with a fork only until the dough is evenly moistened; it will come together but still be a little wet.
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Scoop the dough by the generous tablespoon, placing the scones 2 inches apart on the prepared baking sheet. Wet your fingers and smooth out the tops a bit. Let them sit for 5 minutes to allow the oats to absorb the liquid.
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Bake until the tops and edges are light golden brown, 25 to 27 minutes.
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Remove the scones from the oven and cool on the pan on a rack for 15 minutes before transferring to a rack to cool completely.
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Glaze: Whisk together the ingredients in a small bowl until the glaze has no lumps. Brush over the tops of the cooled scones.