Preheat your oven to 200°C (400°F). Line a baking sheet with parchment paper and set it aside.
In a large mixing bowl, whisk together the white flour, turmeric, salt, and bicarbonate.
Add the cold butter to the flour mixture and rub it in until it resembles coarse breadcrumbs.
Fold in the grated sheep's cheese or cheddar until evenly distributed.
In a separate bowl, whisk together the eggs and yogurt until smooth.
Pour the wet mixture into the dry ingredients and mix gently until just combined.
Transfer the dough onto a floured surface, knead a few times, and pat into a circle about 2-3 cm thick.
Cut out the scones and place them on the prepared baking sheet.
Brush the tops with the egg wash and sprinkle grated parmesan on top.
Bake for 15-20 minutes or until golden brown and cooked through.
Remove from the oven and allow to cool on a wire rack for a few minutes before serving.