Preheat the oven to 190℃ and line a baking tray with a baking paper. Set aside
Sieve the flour and baking powder into a medium mixing bowl. Add sugar and mix well.
Add the butter and cut it into the flour using a pastry cutter (or a large firm fork or fingertips), until the mixture roughly resembles a crumb texture, if there are visible large butter pieces left, use your fingertips to break/rub them into the flour mixture. Make a well in the centre.
In the meantime, in a measuring jug, pour in the milk, add the egg, vanilla paste, then orange zests, whisk until all is well combined.
Add the milk mixture in centre of the flour (where you created the well). Use a fork to mix everything together until it starts to come together but is still roughly crumbly.
Turn the dough onto a floured worksurface and use your hands to bring the dough together, use a rolling pin to flatten it into 2 centimetre thickness (you can use a ruler to be precise).
Use a round cookie cutter to cut out scones, and transfer all onto the prepared baking tray. Brush the top of the scones with the egg wash and sprinkle with sugar.
Bake the scones for about 12 to 14 minutes (see note 3), until slightly browned on top.
Allow the scones to cool on a wire rack and enjoy with coffee, clotted or whipped cream and jam.