Preheat the oven to 220°C (430°F). Put a baking tray that you plan to use in the oven, to warm up.
In a large bowl mix together the self-raising flour with ¼ teaspoon salt and baking powder.Tip: if you do not have self-raising flour, then just take all-purpose flour, and for each cup of flour replace 1½ teaspoons of flour with baking powder. Add the cubed butter to the flour mixture and using your hands mix through until you get a sandy like texture.
Add the caster sugar and mix through again.
Heat the milk in a microwave for about 30 seconds until slightly warm, but not too hot. Add the vanilla extract to the milk and add the lemon juice. Set aside for a few minutes. This will make the milk sour and make like buttermilk. You can also use buttermilk instead, if yo have.
Make a well in the middle of the flour mix. Add the milk and mix it through with a fork or a butter knife.
The dough will be a bit wet at first.
Sprinkle some flour on the work surface and turn out the dough onto the work surface.Knead the dough a couple of times to make it a bit smoother and less sticky.Roll it out t about 4 cm thick disc. Using a medium (about 5 cm) cookie cutter, cut out 4 scones. If the dough is too sticky, dip the cutter into some flour. Reroll the dough again and cut out another 3-4 scones. I got 7 scones in total.
Beat an egg in a small bowl with a fork, brush the tops of the scones with the egg.Carefully take out the hot baking tray. Cover it with parchment paper and carefully place the scones on the tray. Bake for 10-12 minutes, until golden on the tops.
Serve warm or cold, with some cream cheese and jam. I used Philadelphia Cream Cheese and Homemade Strawberry Jam (for recipe see notes below).
Enjoy!