Preheat the oven to 180C (160CFan) and line two baking trays with baking parchment and leave to one side.
Add the flour and cubes of butter to a large bowl and rub together until there are no lumps. Alternatively add the flour and butter into a food processor and pulse until there are no lumps.
Fold through the sugar and create a well in the centre of your dry mixture.
Warm the buttermilk in the microwave on 20-second bursts. Until the buttermilk is steaming.
Pour the buttermilk into your well along with the vanilla extract. Using a knife to bring the mixture together to a dough.
Tip the dough onto a floured surface and gently bring it together with your hands. Press the dough gently to around 4cm thick and cut using a 6cm round cutter.
Bring the dough back together using your hands, flatten and cut the dough. Repeat until you have no dough left.
Place your scones on your baking sheets, ensuring there is equal space between them all.
Whisk your egg, in a large bowl and using a pastry brush glaze the top of each scone.
Bake your scones for 10-12 minutes until they are golden in colour. Leave to cool for 5-10 minutes before serving with jam and clotted cream.