Start off by preheating your oven to 200C. Tip the self-raising flour into a large mixing bowl (no need to sieve), and mix in the salt and the baking powder. Make sure your teaspoon is level when measuring out the baking powder as you can taste it if you use too much, but you want enough of it because this makes the scones nice and fluffy.
Cut the butter into small chunks and rub in until the mix looks like fine bread crumbs. Top tip - shake the bowl to see if all the butter has been rubbed in as the larger crumbs rise to the top of the bowl. Stir in the sugar.
Measure the milk into a jug, and add bit by bit into the dry mixture. Part way through, add in the vanilla extract and stir into the mixture. Carry on adding in the milk until the mixture is quite wet (but not sloppy). Use your hands to 'knead' the dough until all the liquid is absorbed and it is no longer wet - the dough should be smooth. If you have added too much milk, mix in a little more flour - but not too much.
Tip onto a clean work surface and use your hands to pat the dough until it's just over an inch thick. Take a smooth cutter (they give a better rise), roughly 5cm in diameter, and cut out your scone. Repeat until you have 12 scones. Place the scones onto a baking tray lined with greaseproof paper, and use a pastry brush (or your finger) to brush milk over the tops of the scones. Be careful not to let it run down the side of the scones as it can burn when in the oven.
Place on the middle shelf of your preheated oven, and after 15-17 minutes they will be nice and golden! I usually find that most of them are done after 15, but one or two need an extra couple of minutes to finish off! If you can wait long enough, allow them to cool and enjoy with clotted cream and jam. If you don't manage to eat them all within 10 minutes of them coming out of the oven, you can freeze any leftover scones. When defrosting, allow to thaw thoroughly and pop in a low oven (approx 150C) for a couple of minutes to warm through.
As always, I love it when you send me photos of your baking on Twitter - so if you make these please send me a snap!