Preheat the oven to 400 ºF and line a baking sheet with parchment paper.
Whisk flour, sugar, baking powder, and salt, together in a large bowl.
Add butter to the bowl and cut into the flour with a pastry blender until the pea-size. Add the lemon zest and the juice. Gently stir in the berries. Stir in ¾ c of heavy cream.
Press dough together between hands - you're looking for it just hold together.
Add a dribble more cream if it is too dry.
Turn dough out on a lightly floured surface and pat it out to a disc or rectangle - depending on what shape you like your scones.
Cut the scones, and place them on the baking sheet.
Bake for 20 to 25 minutes or until they are just golden brown.
For a sweeter version, drizzle the glaze over the scones while they are still warm. To make the glaze, mix the sugar, cream, and vanilla together until smooth.