For the scones
2 cups (250g) all-purpose / plain flour
1 tsp (9g) baking powder
1/4 tsp (1g) baking soda (bicarbonate of soda)
3 tbsp (37.5g) sugar
1 stick (113g) cold butter
1/2 cup (120 ml) cream or half and half
dash of salt
For the glaze
1 egg
1/4 cup (approximately) of milk, half and half, or cream