Preheat the oven to 425°F.
In a large bowl mix flour, salt, baking soda, baking powder, and sugar. Add the butter, and combine with a pastry cutter or your fingers until the mixture looks like fine crumbs with a few larger pea shapes bits of butter mixed in.
Gently stir berries into the flour.
In a bowl, add the egg and beat lightly. Add buttermilk and vanilla extract and stir to combine.
Add the wet mixture to the dry mixture and gently stir until just combined.
On a floured work surface, gently work the dough into a 1 and 1/2 inch thick dish. Cut the disc into 8 even wedges.
Place scones on a large baking tray lined with parchment paper of Silpat. Bake for 12-15 mins until risen and golden on the top.
Enjoy warm topped with jam, butter, or clotted cream!