Preheat your oven to 400°F (200°C) and line a baking sheet with parchment paper.
In a large mixing bowl, whisk together the flour, sugar, baking powder, baking soda, and salt.
Add the cubed butter to the dry ingredients and use a pastry cutter or your fingertips to rub the butter into the flour until the mixture resembles coarse crumbs.
Gently fold in the lemon zest and blueberries, being careful not to crush the berries.
In a separate bowl, whisk the heavy cream, egg, and lemon juice together until well combined.
Pour the wet ingredients into the dry mixture and stir gently until just combined. Do not overmix; the dough should be slightly sticky.
Turn the dough out onto a floured surface and pat it into a circle about 1 inch thick. Cut into wedges or use a biscuit cutter to create round scones.
Place the scones onto the prepared baking sheet, spacing them about 1 inch apart.
Bake for 15-20 minutes or until the scones are golden brown and a toothpick inserted in the center comes out clean.
Allow to cool slightly on the baking sheet before transferring to a wire rack to cool completely.
Notes
Serve warm with a drizzle of lemon glaze and garnish with fresh blueberries and mint.