Heat the oven to 220ºc/200ºc fan/430F and place a lined baking tray in the oven to preheat.
In a large bowl, rub the butter into the flour, salt, baking powder and sugar mixture until breadcrumbs are formed.
Alternatively, tip the flour, salt, baking powder, sugar and butter into a food processor and pulse until it resembles bread crumbs
Add the lemon juice to the dry mixture with the vanilla
Slowly add the warm milk. Mix in while you add in the liquid as you may not need all of it - you can do this with a spatula, or still in the food processor
Fold/knead through the sultanas until even
Dust the work surface with some flour and tip the dough onto it - fold the dough over a few times so it is smooth but do not over work it
Flatten the dough out until it is about 5cm thick
Dip a 5cm round cutter into the spare flour and cut out the scones
Flatten out the dough again and cut the rest out until the dough is all used up - trying not to over work the dough
Add the scones to the tray and brush the tops with the beaten egg so it's glazed.
Bake in the oven for 10 minutes.
Leave to cool slightly when baked, and enjoy!
Notes
You could easily make this mix and use a smaller cutter so that the scones are more delicate which I often do – I then usually get 12 out of the mix then
I often find these are delicious when still warm as it makes them lighter and fluffier – however they do last in an airtight container for 2-3 days, or freeze for up to 3 months! You can reheat them in the microwave or oven
You can use plain flour, and use 2tsps baking powder instead
You can swap the milk and lemon juice for buttermilk - skip the heating stage and just add it to the dough