Preheat the oven to 200ºC (400ºF).Prepare a baking sheet lined with baking parchment. Sift the plain/all-purpose flour, spelt or whole wheat flour, baking powder and cayenne pepper into a large mixing bowl. Season well with black pepper and a pinch of salt.
Add the chilled, diced butter and rub into the dry ingredients using your fingertips.
When there are only very small specks of butter still visible add the grated Cheddar, Mozzarella and Parmesan cheese and mix to combine.
Make a well in the middle of the mixture and pour in the buttermilk and milk.
Mix the dough with a large spoon then very lightly bring the mixture together with your hands to a rough ball.Turn the dough onto a lightly floured surface and knead for 10 seconds. Flatten or roll out to a thickness of 1.5 - 2 cm / ⅝ - ¾ inch. Use a 5 cm / 2 inch round cookie cutter to stamp out rounds and arrange on the prepare baking sheet, leaving a little space between each scone to allow for spreading during baking. Gather the dough scraps into a ball, re-roll and stamp out more scones.
Brush the top of the scones with a little milk, scatter with the extra cheeses and a pinch of cayenne pepper.
Bake on the middle shelf of the preheated oven for about 13 - 15 minutes until well-risen and golden brown. Cool on a wire rack.
Split the scones in half and spread with butter to serve or simply eat them as they are.