Preheat the oven to 400F and line a cupcake / muffin tray with muffin liners.
Sift the flour, salt and baking powder.
Cream the butter and sugar together and add the eggs to it one by one, beating well after each addition. Pour in the milk, lemon juice and lemon zest. Mix well.
Add the wet ingredients to the dry ingredients and fold gently to just combine.
Now add the blueberries and mix it in.
Pour into the muffin liners and bake in the oven for 20-25 mins. Serve warm.