oven on gas 7, baking sheet in to warm up
rub 85g cold butter into 350g SR flour & 1tsp baking powder
stir in 3 tbsp caster sugar
warm 175ml milk for 30 secs in microwave, add splash lemon juice and stir into flour mix.
pat out and cut
glaze with beaten egg
get tray out, dust lightly with flour, put scones on and bake for 10 mins.
this is my basic recipe for plain scones. usually get between 6-8 - I dont usually use a cutter, just a knife so I don't faff with re-patting out etc… number depends on how deep you want them.
I use this as the basis for making variations of cheese scones (ditch the sugar), apple and cinnamon, sultana, cherry etc etc
won first prize in the village show last year 
the trick is hot tray and warm, sour milk… (or so my granny taught me! she also said don't faff with fancy cutters!)