Triple sift the dry ingredients into a large bowl. (If your room temperature is very hot refrigerate the sifted ingredients until cold.)
Add the frozen grated butter into the dry ingredients until it resembles very coarse bread crumbs with some pea-sized pieces if you want flaky scones or until it resembles coarse beach sand if you want tender scones.
Add nearly all of the liquid at once (for the strawberries and cream scones, add all the cream and then half of the milk first) into the rubbed-in flour/fat mixture and mix until it just forms a sticky dough (add the remaining liquid if needed). The wetter the dough the lighter the scones (biscuits) will be!
Turn the dough out onto a lightly floured board, lightly flour the top of the dough. To achieve an even homogeneous crumb to your scones knead very gently about 4 or 5 times (do not press too firmly) the dough until it is smooth.
Pat or very lightly roll out the dough into a 6u201d by 4u201d rectangle that is about 3/4u201d thick. Using a well-floured 2 1/4u201c (58mm) round cutter stamp out, without twisting, 4 or 5 rounds. Gently reform the scraps (do not knead) into another 3/4u201c layer and cut two or three more scones (these two scones will not raise as well as the others since the extra handling will slightly toughen the dough). Otherwise use a well-floured sharp knife to form squares or wedges.
Place the rounds just touching on a parchment lined baking tray. If you wish to have soft-sided scones place them close to one another or spaced widely apart on the baking tray if you wish to have crisp-sided scones. Glaze the tops with milk if you want a golden colour on your scones or lightly flour if you want a more traditional look.
Bake the scones at 240C (475F) for about 10 minutes until the scones are well risen and are lightly coloured on the tops. The scones are ready when the sides are set. Place onto cooling rack to stop the cooking process.
Each of these two recipes makes 6 or 7 scones about 2 1/4" diameter.